Question

A car of mass 1000kg moving with velocity 72km/h takes 4seconds to stop when brakes are applied the force exerted by brakes is→_→
1)+4500N
2)-4500N
3)+5000N
4)-5000N

Answer 1

Explanation:

final velocity = 0

initial velocity = 72 km/hr = 20 m/s

mass = 1000 kg

time = 4 sec

force = 1000 (20/4) = 5000 N