Question

A ball rolls from point A to point B. The total energy of the ball at point A isn’t the same as the sum of its potential energy and kinetic energy at point B. Which statement best explains this situation?
The rolling ball doesn’t follow the law of conservation of energy.
Some of the ball’s energy is transformed to thermal energy.
The rolling ball loses some of its energy because of gravity.
The ball absorbs some of its own potential energy.

Answer 1

As the ball rolls down the inclined plane, frictional force acting on it produces heat which generates thermal energy. 
The loss in energy is due to frictional force.

Hence correct option is some of the ball's energy is transformed to thermal energy.
Hope this helps!

Answer 2

Answer:

The correct answer is "Some of the ball’s energy is transformed to thermal energy."

Explanation:

I am 100 % sure.