The mass is m = 10kg, and the flatbed truck is long enough. On the smooth horizontal plane, a small car is placed at the left end, M = 1kg, and u = 0.2 When the speed of the trolley to the ground is 10m / s, calculate the speed of the trolley

The mass is m = 10kg, and the flatbed truck is long enough. On the smooth horizontal plane, a small car is placed at the left end, M = 1kg, and u = 0.2 When the speed of the trolley to the ground is 10m / s, calculate the speed of the trolley

I think the conservation of momentum should be used in this problem
This is because it's stationary on a smooth horizontal plane, P = 0
m x 10 + M x V=P
Substituting data
So v = - 1m / s

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