Question

Calculate change in momentum of a car 1500 kg when its speed decreases from 72km/h to 36km/h

Answer 1

Answer:

change in momentum is m(v-u)

Explanation:

72km/h = 20m/s

36km/h = 10m/s

1500(20-10)

15000kg*m/s

Answer 2

Answer:

Given :-

Mass of the car = 1500kg

Initial Velocity (u) = 36km/h = 36×5/18 = 10m/s

Initial Momentum (mu) = 1500×10 = 15,000kg.m/s

Final Velocity (v) = 72km/h = 72×5/18 = 20m/s

Final Momentum (mv) = 1500×20 = 30,000kg.m/s

Change in momentum = P2-p1

= 30,000-15,000

= 15,000kg.m/s.