Find distance as function of time.












0












$begingroup$


A car starts from rest and accelerates in $a = frac{2cdot m}{3cdot s^3}t$,



After $3$ seconds, The car will be $27$ metres from beginning.



Find distance as function of time.



I know i have to integral the acceleration,But i don't know how.



I found the Equation is $x_{t} = 24 + frac{1}{3} t^2$.



What do you think ?










share|cite|improve this question











$endgroup$








  • 1




    $begingroup$
    This makes no sense. If the initial speed is 0 and the acceleration is 2/3 then the distance is $t^2/3$ giving a distance 3 m at 3 s, not 27.
    $endgroup$
    – almagest
    Mar 18 '16 at 14:09










  • $begingroup$
    I completely agree. This doesn't make sense. By the way, units of $a$ seems wrong.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:10


















0












$begingroup$


A car starts from rest and accelerates in $a = frac{2cdot m}{3cdot s^3}t$,



After $3$ seconds, The car will be $27$ metres from beginning.



Find distance as function of time.



I know i have to integral the acceleration,But i don't know how.



I found the Equation is $x_{t} = 24 + frac{1}{3} t^2$.



What do you think ?










share|cite|improve this question











$endgroup$








  • 1




    $begingroup$
    This makes no sense. If the initial speed is 0 and the acceleration is 2/3 then the distance is $t^2/3$ giving a distance 3 m at 3 s, not 27.
    $endgroup$
    – almagest
    Mar 18 '16 at 14:09










  • $begingroup$
    I completely agree. This doesn't make sense. By the way, units of $a$ seems wrong.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:10
















0












0








0





$begingroup$


A car starts from rest and accelerates in $a = frac{2cdot m}{3cdot s^3}t$,



After $3$ seconds, The car will be $27$ metres from beginning.



Find distance as function of time.



I know i have to integral the acceleration,But i don't know how.



I found the Equation is $x_{t} = 24 + frac{1}{3} t^2$.



What do you think ?










share|cite|improve this question











$endgroup$




A car starts from rest and accelerates in $a = frac{2cdot m}{3cdot s^3}t$,



After $3$ seconds, The car will be $27$ metres from beginning.



Find distance as function of time.



I know i have to integral the acceleration,But i don't know how.



I found the Equation is $x_{t} = 24 + frac{1}{3} t^2$.



What do you think ?







physics






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Mar 18 '16 at 14:16







Noam

















asked Mar 18 '16 at 13:56









NoamNoam

385113




385113








  • 1




    $begingroup$
    This makes no sense. If the initial speed is 0 and the acceleration is 2/3 then the distance is $t^2/3$ giving a distance 3 m at 3 s, not 27.
    $endgroup$
    – almagest
    Mar 18 '16 at 14:09










  • $begingroup$
    I completely agree. This doesn't make sense. By the way, units of $a$ seems wrong.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:10
















  • 1




    $begingroup$
    This makes no sense. If the initial speed is 0 and the acceleration is 2/3 then the distance is $t^2/3$ giving a distance 3 m at 3 s, not 27.
    $endgroup$
    – almagest
    Mar 18 '16 at 14:09










  • $begingroup$
    I completely agree. This doesn't make sense. By the way, units of $a$ seems wrong.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:10










1




1




$begingroup$
This makes no sense. If the initial speed is 0 and the acceleration is 2/3 then the distance is $t^2/3$ giving a distance 3 m at 3 s, not 27.
$endgroup$
– almagest
Mar 18 '16 at 14:09




$begingroup$
This makes no sense. If the initial speed is 0 and the acceleration is 2/3 then the distance is $t^2/3$ giving a distance 3 m at 3 s, not 27.
$endgroup$
– almagest
Mar 18 '16 at 14:09












$begingroup$
I completely agree. This doesn't make sense. By the way, units of $a$ seems wrong.
$endgroup$
– Win Vineeth
Mar 18 '16 at 14:10






$begingroup$
I completely agree. This doesn't make sense. By the way, units of $a$ seems wrong.
$endgroup$
– Win Vineeth
Mar 18 '16 at 14:10












2 Answers
2






active

oldest

votes


















0












$begingroup$

You know that $x=ut+frac{1}{2}at^2$



Since the car starts from rest, $u=0$ and $x(t)=frac{1}{2}at^2$



If $x(3)=27$, then $a=3m/s^2$



The equation is $x(t)=frac 32 t^2$






share|cite|improve this answer









$endgroup$













  • $begingroup$
    $a = frac{2cdot m}{3cdot s^2}$
    $endgroup$
    – Noam
    Mar 18 '16 at 14:06










  • $begingroup$
    That would mean it didn't start at $x=0$. Else, it's an impossible question.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:09



















0












$begingroup$

$a(t) = v'(t) = x''(t)$; we integrate acceleration to find velocity, than integrate that to find position as a function of time. We're given $a(t) = frac{2}{3}t$ and the initial values $x(0) = 0, v(0) = 0$ (because the car starts from rest) and $x(3) = 27$. Can you figure out $x(t)$ from here?






share|cite|improve this answer











$endgroup$













  • $begingroup$
    I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
    $endgroup$
    – Noam
    Mar 18 '16 at 14:07












  • $begingroup$
    Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:07












  • $begingroup$
    What do you mean ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:08










  • $begingroup$
    Sorry, accidentally submitted before I was finished. See my edited version.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:11










  • $begingroup$
    $a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:19













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2 Answers
2






active

oldest

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2 Answers
2






active

oldest

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active

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active

oldest

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0












$begingroup$

You know that $x=ut+frac{1}{2}at^2$



Since the car starts from rest, $u=0$ and $x(t)=frac{1}{2}at^2$



If $x(3)=27$, then $a=3m/s^2$



The equation is $x(t)=frac 32 t^2$






share|cite|improve this answer









$endgroup$













  • $begingroup$
    $a = frac{2cdot m}{3cdot s^2}$
    $endgroup$
    – Noam
    Mar 18 '16 at 14:06










  • $begingroup$
    That would mean it didn't start at $x=0$. Else, it's an impossible question.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:09
















0












$begingroup$

You know that $x=ut+frac{1}{2}at^2$



Since the car starts from rest, $u=0$ and $x(t)=frac{1}{2}at^2$



If $x(3)=27$, then $a=3m/s^2$



The equation is $x(t)=frac 32 t^2$






share|cite|improve this answer









$endgroup$













  • $begingroup$
    $a = frac{2cdot m}{3cdot s^2}$
    $endgroup$
    – Noam
    Mar 18 '16 at 14:06










  • $begingroup$
    That would mean it didn't start at $x=0$. Else, it's an impossible question.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:09














0












0








0





$begingroup$

You know that $x=ut+frac{1}{2}at^2$



Since the car starts from rest, $u=0$ and $x(t)=frac{1}{2}at^2$



If $x(3)=27$, then $a=3m/s^2$



The equation is $x(t)=frac 32 t^2$






share|cite|improve this answer









$endgroup$



You know that $x=ut+frac{1}{2}at^2$



Since the car starts from rest, $u=0$ and $x(t)=frac{1}{2}at^2$



If $x(3)=27$, then $a=3m/s^2$



The equation is $x(t)=frac 32 t^2$







share|cite|improve this answer












share|cite|improve this answer



share|cite|improve this answer










answered Mar 18 '16 at 14:04









Win VineethWin Vineeth

3,270527




3,270527












  • $begingroup$
    $a = frac{2cdot m}{3cdot s^2}$
    $endgroup$
    – Noam
    Mar 18 '16 at 14:06










  • $begingroup$
    That would mean it didn't start at $x=0$. Else, it's an impossible question.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:09


















  • $begingroup$
    $a = frac{2cdot m}{3cdot s^2}$
    $endgroup$
    – Noam
    Mar 18 '16 at 14:06










  • $begingroup$
    That would mean it didn't start at $x=0$. Else, it's an impossible question.
    $endgroup$
    – Win Vineeth
    Mar 18 '16 at 14:09
















$begingroup$
$a = frac{2cdot m}{3cdot s^2}$
$endgroup$
– Noam
Mar 18 '16 at 14:06




$begingroup$
$a = frac{2cdot m}{3cdot s^2}$
$endgroup$
– Noam
Mar 18 '16 at 14:06












$begingroup$
That would mean it didn't start at $x=0$. Else, it's an impossible question.
$endgroup$
– Win Vineeth
Mar 18 '16 at 14:09




$begingroup$
That would mean it didn't start at $x=0$. Else, it's an impossible question.
$endgroup$
– Win Vineeth
Mar 18 '16 at 14:09











0












$begingroup$

$a(t) = v'(t) = x''(t)$; we integrate acceleration to find velocity, than integrate that to find position as a function of time. We're given $a(t) = frac{2}{3}t$ and the initial values $x(0) = 0, v(0) = 0$ (because the car starts from rest) and $x(3) = 27$. Can you figure out $x(t)$ from here?






share|cite|improve this answer











$endgroup$













  • $begingroup$
    I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
    $endgroup$
    – Noam
    Mar 18 '16 at 14:07












  • $begingroup$
    Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:07












  • $begingroup$
    What do you mean ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:08










  • $begingroup$
    Sorry, accidentally submitted before I was finished. See my edited version.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:11










  • $begingroup$
    $a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:19


















0












$begingroup$

$a(t) = v'(t) = x''(t)$; we integrate acceleration to find velocity, than integrate that to find position as a function of time. We're given $a(t) = frac{2}{3}t$ and the initial values $x(0) = 0, v(0) = 0$ (because the car starts from rest) and $x(3) = 27$. Can you figure out $x(t)$ from here?






share|cite|improve this answer











$endgroup$













  • $begingroup$
    I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
    $endgroup$
    – Noam
    Mar 18 '16 at 14:07












  • $begingroup$
    Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:07












  • $begingroup$
    What do you mean ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:08










  • $begingroup$
    Sorry, accidentally submitted before I was finished. See my edited version.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:11










  • $begingroup$
    $a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:19
















0












0








0





$begingroup$

$a(t) = v'(t) = x''(t)$; we integrate acceleration to find velocity, than integrate that to find position as a function of time. We're given $a(t) = frac{2}{3}t$ and the initial values $x(0) = 0, v(0) = 0$ (because the car starts from rest) and $x(3) = 27$. Can you figure out $x(t)$ from here?






share|cite|improve this answer











$endgroup$



$a(t) = v'(t) = x''(t)$; we integrate acceleration to find velocity, than integrate that to find position as a function of time. We're given $a(t) = frac{2}{3}t$ and the initial values $x(0) = 0, v(0) = 0$ (because the car starts from rest) and $x(3) = 27$. Can you figure out $x(t)$ from here?







share|cite|improve this answer














share|cite|improve this answer



share|cite|improve this answer








edited Mar 18 '16 at 16:17

























answered Mar 18 '16 at 14:01









DylanSpDylanSp

1,589714




1,589714












  • $begingroup$
    I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
    $endgroup$
    – Noam
    Mar 18 '16 at 14:07












  • $begingroup$
    Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:07












  • $begingroup$
    What do you mean ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:08










  • $begingroup$
    Sorry, accidentally submitted before I was finished. See my edited version.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:11










  • $begingroup$
    $a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:19




















  • $begingroup$
    I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
    $endgroup$
    – Noam
    Mar 18 '16 at 14:07












  • $begingroup$
    Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:07












  • $begingroup$
    What do you mean ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:08










  • $begingroup$
    Sorry, accidentally submitted before I was finished. See my edited version.
    $endgroup$
    – DylanSp
    Mar 18 '16 at 14:11










  • $begingroup$
    $a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
    $endgroup$
    – Noam
    Mar 18 '16 at 14:19


















$begingroup$
I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
$endgroup$
– Noam
Mar 18 '16 at 14:07






$begingroup$
I got your point. But should I do integral for what ? $int frac{2}{3}t$ or $int frac{2}{3}t^2$ ? I have some mis-understaing with the context of integration and velocity,acceleration and position.
$endgroup$
– Noam
Mar 18 '16 at 14:07














$begingroup$
Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
$endgroup$
– DylanSp
Mar 18 '16 at 14:07






$begingroup$
Take it one step at a time. $v(t) = int a(t) , dt = int frac{2}{3} , dt = frac{2}{3}t + C_1$. Follow a similar process to find $x(t) = int v(t) , dt$, then use the initial values to find $C_1$ and $C_2$.
$endgroup$
– DylanSp
Mar 18 '16 at 14:07














$begingroup$
What do you mean ?
$endgroup$
– Noam
Mar 18 '16 at 14:08




$begingroup$
What do you mean ?
$endgroup$
– Noam
Mar 18 '16 at 14:08












$begingroup$
Sorry, accidentally submitted before I was finished. See my edited version.
$endgroup$
– DylanSp
Mar 18 '16 at 14:11




$begingroup$
Sorry, accidentally submitted before I was finished. See my edited version.
$endgroup$
– DylanSp
Mar 18 '16 at 14:11












$begingroup$
$a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
$endgroup$
– Noam
Mar 18 '16 at 14:19






$begingroup$
$a(t) = frac{2}{3}t$. $v(t) = int a(t) = frac{1}{3}t^2 + v_{0}$. $x(t) = int v(t) = frac{1}{9} + v_{0}t+x_{0}$. $27 = frac{1}{9}t^{3}+x_{0}$. the final eqation is - $x(t) = frac{1}{9}t^3+24$. What do you think ?
$endgroup$
– Noam
Mar 18 '16 at 14:19




















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