A 88-kg ice-skater glides with a speed of 5 m/s toward a 13-kg sled at rest on the ice. The ice-skater reaches the sled and holds on to it. The ice-skater and the sled then continue sliding in the same direction in which the ice-skater was originally skating. What is the speed of the ice-skater and the sled after they collide?
conserve momentum
88*5 + 13*0 = (88+13)v