Question

A car travels 100m as it accelerates from rest at 25m/s. Calculate the acceleration.

Answer 1

$v_f^2=v_i^2+2aS$

Rearranging for a,

$a=\frac{v_f^2-v_i^2}{2S}=\frac{(25\frac{m}{s})^2-(0\frac{m}{s})^2}{2\times100\ m}=3.125\frac{m}{s^2}$

Answer: $3.125\frac{m}{s^2}$