Car A of mass 1500 kg travelling at 25 m/s collides with another car B of mass 1000 kg
travelling at 15 m/s in the same direction. After collision, the velocity of car A becomes 20 m/s.
Calculate the velocity of car B after collision.
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Momentum of system (before collision) = Momentum of system (after collision) { law of conservation of energy }
mu1(A) + mu2(B) = mv1(A) + mv2(B)
(1500×25) + (1000×15) = (1500×20)+(1000×v)
37500 + 15000 = 30000 + 1000v
52500 = 30000 = 1000v
22500 = 1000v
v = 22500/1000
v = 22.5 m/s
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