Elliot jumps up and down on a pogo stick. He has a mass of 60 kg, and his pogo stick has a spring with spring constant of 1100
N/m. What is his gravitational potential energy when he jumps
to a height of 0.25 m? Use 9.8 m/s/s for g.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.