Gravitational potential energy calculation problems for students to solve.

A worksheet titled "Gravitational Potential Energy" with four problems asking to calculate gravitational potential energy for different masses at various heights, including a 60 kg person 1 m above ground, a 10 kg rock on a 15 m hill, a 55 kg person on a bicycle at the top of a 7 m hill, and a 50 kg dog jumping from a 2 m porch. The bottom text states, "Solving 12 problems correctly reveals the answer to a riddle."