The correct answer is: b. Potential energy is converted into kinetic energy.
Why is it potential energy converted to kinetic energy?
At point D, the ball has reached the ground level and thus has zero potential energy (PE) as its height is zero.
However, it still has a non-zero velocity (v) gained from rolling down the hill, meaning its kinetic energy (KE) is not zero.
As the ball moves from D to G, it starts climbing the incline again, losing its KE and gaining PE. This is because the gravitational force is now acting against its motion.
Therefore, there is a conversion of KE to PE as the ball rises towards G.
So, option b accurately describes the transformation of energy in this scenario.
Options a and c are incorrect:
Option a suggests the opposite of what happens, as KE decreases while PE increases.
Option c is impossible as energy cannot be created or destroyed, and the ball clearly loses KE as it gains