1. The problem statement, all variables and given/known data A man of mass 65kg is running at speed of 4.9m/s, jumps in to a rowboat of 88kg that is drifting without friction in the same direction at a speed of 1.2m/s. when the man is seated in the rowboat, what is the final velocity of the boat? 2. Relevant equations Momentum before = momentum after 3. The attempt at a solution If m= mass of man = 65kg v= velocity of man = 4.9m/s m' = mass of rowboat = 88kg v' = velocity of rowboat = 1.2m/s V= required final velocity let M= mass of both rowboat and man = m+ m' = 153kg now law of conservation of momentum momentum before = momentum after i-e mv = M(v'+V) so V= (mv-Mv')/M = 0.88 m/s is it right method ? but how could the speed of rowboat is such less?