Question

A runner increases his velocity from 0 m/s to 20 m/s in 2.0s. What was his average acceleration?

Answer 1

change in velocity = 20 - 0 = 20

change in time = 2 seconds

Divide the change in velocity over the change in time: 20/2 = 10

The average acceleration is 10 m/s^2

I.e, each second, the speed increases by 10 m/s