1. Calculate the potential energy of the blue object with a mass of 7 Kg from the following heights:

BLUE object: h = 4.5 m;  BLUE object: h = 2.0 m; BLUE object: h = 1.0 m.

2. Observe the variation of the potential energy when the bodies are dropped ("play").

3. Find out how the potential energy changes with the body's mass.