Question

A runner starts from rest and accelerates uniformly to a speed of 8.0 meters per second in 4.0 seconds. What is the magnitude of the acceleration of the runner?

Answer 1

solution;

given data

initial velocity(u)=0m/s

final velocity(v)=8m/s

time(t)=4sec

according to first equation of motion

$v=u+at$

acceleration

$a=\frac{v-u}{t}$

putting the value

$a=\frac{8-0}{4}=2m/s^2$

therefore acceleration of runner is $2m/s^2$ .