A 3.23 kg ball is attached to a ceiling by a 1.31 m long string. The height of the room is 5.75 m. What is the gravitational potential energy of the ball relative to the ceiling?
What is the gravitational potential energy of the ball relative to the floor?
What is the gravitational potential energy of the ball relative to a point at the same elevation as the ball?
relative to the ceiling? it has less PE, by mg(1.31).
for the floor, it has positive mgh , h is the distance from the floor to the ball.