Question

A car accelerates from rest to a velocity of 5 m/s in 4 seconds. What is its average acceleration over this period of time?

Answer 1

average velocity is given as change in velocity / time taken.

Change in velocity can be represented as v - u ie final velocity - initial velocity

In this case ,

v = 5 m/s

u = 0

t = 4 sec

a = v-u / t

= 5 - 0 / 4

= 5/4

= 1.25 m/s²

Hence, the acceleration will be 1.25 m/s²