Physics  Momentum
posted by DJ .
A child in a boat throws a 5.60 kg package out horizontally with a speed of 10.0 m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 22.0 kg and that of the boat is 55.0 kg.

5.6*10(22+55)V =0

M1V1 = M2V2 so
5.6*10 = (22+55)V2
56/77 = V2
0.727