Question

A car of mass 1500 kg travelling at 25 m per second collides with another copy of mass 1000 kg travelling at 15 M per second in same direction . After collision the velocity of car is 20 m per second . Calculate the velocity of car b after collision.

Answer 1

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
v4 = 11.5 m/s
hope it hlps