Question

A runner covers the last straight stretch of a race in 4s During the time he speeds up from 5m/s to 9ms. What is the runners acceleration in this part of the race?

Answer 1

Answer: 1m/s^2

Explanation: The formula to find acceleration is:

a = (vf - vi) / t

where:

a= acceleration

vf= final velocity

vi= intial velocity

t= time

By substituting these values ​​in the acceleration equation, we obtain:

a = (9 m/s - 5 m/s) / 4 s

we get:

a = 1 m/s^2