What is the bus potential energy halfway on the top of the hill?

A. 2500 J B. 1500 J C. 3000 J D. 2000 J

What is the bus kinetic energy when reach down the hill?

A. 2000 J B. 1500 J C. 3000 J D. 4500 J

If the bus kinetic energy is increase down the hill, what happen to the potential energy of the bus?

A. The potential energy of the bus is also increase.
B. The potential energy of the bus is double.
C. The potential energy of the bus is destroyed.
D. The potential energy of the bus is completely transform into another form of mechanical energy which is kinetic energy.​