Abhisar
  • Abhisar
position vector of a particle is given by \(\sf r = r_0(1-at)t\) , where t is the time and a as well as \(\sf r_0\) are constant. How much distance is covered by the particle in returning to the starting point?
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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Abhisar
  • Abhisar
@ash2326
Abhisar
  • Abhisar
@radar @waterineyes
anonymous
  • anonymous
@pinkbubbles

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anonymous
  • anonymous
sorry i'm not sure @SolomonZelman
Abhisar
  • Abhisar
It's ok c:
Abhisar
  • Abhisar
@Jhannybean !!
Abhisar
  • Abhisar
@midhun.madhu1987 @mathstudent55
Abhisar
  • Abhisar
@ParthKohli
anonymous
  • anonymous
so you want to solve for when \(r(t)=0\implies t-at^2=1\implies t(at-1)=0\) so $$t=0\text{ or }t=\frac1a$$ so presumably we're taking the \(t=1/a\) root, and the distance covered is given by: $$\begin{align*}s&=\frac12\int_0^t \|r'(\tau)\|\,d\tau\end{align*}$$ i.e. half the total distance, but notice our path is completely collinear, and we know we reach our furthest point at \(t=1/(2a)\) (midpoint of the roots) so our distance on the return is equal to the distance going: $$d=\left\|r\left(\frac1{2a}\right)-r(0)\right\|=\|r_0\|\cdot\frac1{2a}\left(1-\frac12\right)=\frac{\|r_0\|}{4a}$$

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