Amover hoists a 200 kg piano from the ground to a height of 10 m using a single pulley. what was the change in the pianos energy? a. 20j b. 200j c. 2000j d. 2

d. 20000 J

Explanation:

Potential energy is the energy possessed by an object by virtue of its position.

m= mass of object = 200 kg

g = acceleration due to gravity =

h = height of an object

1. when h= 10 m

2. when h= 0 m

Thus change in energy=(20000-0)Joules=20000Joules.