1. The problem statement, all variables and given/known data 2. Relevant equations Momentum = mass x velocity 3. The attempt at a solution Answer is A. when mass decreases, speed should increase for momentum to be constant. and when mass increases, velocity decreases. i could understand the graph up the before t2 with this. but at t2, why does speed of smith increases and that of jones decrease. shouldn't it be like in answer E???