One of the statements below is correct In an ideal system where all forms of friction are ignored?
a. Gravitational potential energy is transformed into Kinetic energy and vice versa
b. Gravitational energy is transformed to thermal energy
c. Kinetic energy is not transformed to gravitational potential energy
d. All of the above

a.

Explanation:

In a perfect system then energy can be changed from Kinetic to Gravitational Potential and vice versa without any losses. A common form of loss would be thermal energy, so b. is not the answer. c. is invalid as we want these 2 forms of energy to be transferred between, and d. is invalid as these statements c and a contradict each other.

this would be about 43%