Question

A 1.5 kg rock is dropped from a height of 2.0 meters onto a spring that

compresses and brings the rock to rest. (Assume no losses to thermal
energy.) How much energy is in the system before the drop.

Answer 1

29.4 J

Step-by-step explanation:

Before the drop, the system has only the gravitational potential energy, and this energy us given by mass×gravity×height:

1.5•9.8•2 = 29.4 J