A ball is rolling up and over a hill. The ball slows down as it moves from Position 1 to Position 3, and it speeds up as it moves from Position 3 to Position 5.
At which point is the ball's kinetic energy being transformed into gravitatical potential energy?
Only when the ball rolls from Position 1 to Position 3.
Only when the ball rolls from Position 3 to Position 5.
The entire time the ball is rolling from Position 1 to Position 5.
It is not being transformed at any time because kinetic energy cannot be transformed into gravitational potential energy.