1. A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.

Question

A car starts from rest and accelerates uniformly over a time of 5.21 seconds for a distance of 110 m. Determine the acceleration of the car.

Have you started from rest ? I mean, what have you tried on this issue ? — Jean Marie, Sep 08 '17 at 19:37
a = (vf - vi) / (tf - ti) a = (110m - 0m) / (5.21s - 0s) a = 110m / 5.21s a = 21.11 m/s^2
this is how i would have answered it — Katie, Sep 08 '17 at 19:46

score 1 · Answer 1 · answered Sep 08 '17 at 19:32

1

$s=\dfrac{a t^2}{2}$

$110=\dfrac{a 5.21^2}{2}$

$a=8.1ms^{-2}$

answered Sep 08 '17 at 19:32

Raffaele

thank you! where does the two come from? the formula? – Katie Sep 08 '17 at 19:45
Uniformly accelerated motion. Formula [2] https://en.wikipedia.org/wiki/Equations_of_motion#Uniform_acceleration where $r_0=0;;v_0=0$ because the car starts from the rest – Raffaele Sep 08 '17 at 19:56

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