Question

In which situation does the energy constantly change from gravitational potential energy to kinetic energy?

Answer 1

A ball is dropped off a cliff into a canyon.

A ball rests on a table.

A meteor flies through space.

A ball is thrown upward into the air and reaches its highest point.

Answer 2

A ball resting on a table maintains its PE.

A meteor flying through space essentially only has kinetic energy since PE = mgh.

A ball thrown upward into the air is decreasing it's KE and increasing it's PE (mgh) on the way up...and vice-versa on the way down.

Answer 3

A 1,200 kg car rolls down a hill with its brakes off and transmission in neutral. At one moment it is moving 5.0 m/s. A little later it is moving at 8.2 m/s. How much did its height change between the two times? Assume friction and air resistance have no effect on its motion.
(Points : 1)
1.5 m

2.2 m

4.3 m

1.9 m