Question

what is change in momentum of a car weighing 1500kg when its speed increase from 36km/hr to 72km/hr uniformly

Answer 1

Mass of car= 1500 kg=m
Initial velocity of car = 36 km/h = 36 ×5/18 m/s = 10 m/s =u
Final velocity of car = 72 km/h = 72×5/18 m/s = 20 m/s=v
Initial momentum of car =mu = 1500×10= 15000 kg m/s
Final momentum of car= mv= 1500×20=30000 kg m/s
Change in momentum = Final momentum - Initial momentum = 30000-15000= 15000