Question

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.
A)
3.5 m/s2
B)
5.7 m/s^2
C)
20 m/s^2
D)
70 m/s^2

Answer 1

acceleration is always a change in velocity over a change in time
\[a = \frac{v_f - v_i}{t_f - t_i}\]