Question

A truck is moving with a velocity of 72 km/h and it takes 5 second to stop after the brakes are applied. calculate the force exerted by brakes. mass of truck is 1200 kg.

Answer 1

this way u can solve here it is
v=0
u=20
a=(v-u)/t
-4
f=ma
f=1200*4=4800(in backward direction)