A 50 kg skier is initially at rest on the top of a hill. The hill has a vertical elevation of 10 m. At the bottom of the hill is a 25 kg sled, also initially at rest.
The skier slides down the hill, picking up speed. When the skier gets to the bottom of the hill, he jumps onto the sled. At that point the sled moves forward with a final velocity, Vf. Ignore friction.
What is the speed of the skier at the bottom just before jumping on the sled? And what is the speed of the skier/sled after he jumps onto sled?