a car 'A' of mass 1500 kg, travelling at 25 ms-1,collides with another car 'B' of mass 1000 kg ,travelling at 15 ms-1 in the same direction. After collision the velocity of car A becomes 20ms-1. calculate the velocity of car B after collision.
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m1 = 1500kg
v1 = 25 m/s
m2 = 1000kg
v2 = 40 m/s
v3 = 20 m/s
v4 = ?
m1v1+m2v2 = m1v3+m2v4
(1500×25)+(1000×40) = (1500×20)+ 1000v4
(37500 + 4000) - 30000 = 1000v4
v4 = 11500/1000
v4 = 115/10
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