Question

A 2.50 kg trophy is moved from a shelf 2.00 m high to another 3.00 m from the floor. The work

done to move the trophy from the lower shelf to the higher one is

Answer 1

The work is equal to the change in potential energy, or

$$W=\Delta E=mg\Delta h=2.5·9.8(3-2)=24.5\text{ J}.$$