Question

A motion cycle is moving with a velocity of 90km\hr & it takes 5second to stop after the brakes are applied. Calculate the exerted by the brakes on the motorcycle if the mass of motorcycle along the rider 120kg.

Answer 1

speed=90kmph=90×5÷18=25m/s
t=5s
brakes applied so v=0
m=120kg
a=v-u/t
a=0-25/5
a=-5m/s
f =ma
f=120×-5
f=-600N
- sign represent the force moving opposite direction