Solve the all parts of given problem:
Problem: For a movie scene, an 80kg stuntman drops from a tree onto a 46kg sled that is moving on a frozen lake with a velocity of 10m/s toward the shore.
Part A: What is the speed of the sled after the stuntman is on board?
Part B: If the sled hits the bank and stops, but the stuntman keeps on going, with what speed does he leave the sled? (Neglect friction.)
I want help to find the speed of the sled after the stuntman is on board.