Conservation of Momentum — “Medicine” Ball, Sandbags, and Carts

“Medicine” Ball and Carts: Two students sit on the carts, facing each other. A big heavy “medicine” ball is given to one of them by the instructor. Students begin throwing the ball to each other. Very soon they find themselves far apart compared to their initial position.

Sandbags and a Cart: Instructor gives a student sandbags one at a time and he/she throws them forward. The cart moves in the opposite direction.