Question

A motorcar is moving with a velocity of 108 km/h and it takes 4 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1000 kg.

Answer 1

Explanation:

u= (108×5/18) m/s

30m/s

v=0

t=4s

a= v-u/t

0/4-30/4

-7.5m/s²

m=1000kg

F=ma

1000×(-7.5)

-7500N

Answer 2

Answer:

answer is -7500 N

thanks