1. The problem statement, all variables and given/known data An empty sled is sliding on frictionless ice when Susan drops vertically from a tree above onto the sled. When she lands, does the sled speed up, slow down, or keep the same speed? The sled slows down. Later, susan falls sideways off the sled. When she drops off, does the sled speed up, slow down, or keep the same speed? 3. The attempt at a solution I would think that when she falls off the sled, the speed of the sled should increase because m2 got smaller, so to conserve momentum, v2 should get larger m1v1 = m2v2 however, the answer is that the sled keeps the same speed... why?