Question

calculate the change in momentum of a van weighting 1200kg when its speed decrease from 72 km/hr to 54 km/hr uniformly

Answer 1

MASS (m) = 1200 kg
INITIAL VELOCITY (u) = 72 km/h = 20 m/s
FINAL VELOCITY (v) = 54 km/h = 15 m/s


Change in momentum
= mv - mu
= m (v-u)
= { 1200 (20-15) } kg m/s
= { 1200 × 5 } kg m/s
= 6000 kg m/s