Question 1
A cyclist stops pedalling at the foot of a hill and freewheels over it. At the summit, what is true of the bicycle’s energy?
The right answer is the one marked above.
Kinetic energy is at a minimum and potential energy at a maximum. The bicycle slowed as it climbed, so its kinetic energy fell; it rose as it climbed, so its potential energy grew.
Nothing was created or destroyed on the way up. The same energy simply changed which of the two forms it was held in.