A. As the biker is climbing the hill. B. As the biker is at the top of the hill. C. AS the biker is on the downside of the hill. D. There is no example of kinetic energy.

The correct option is C - As biker is on the downside of the hill that is where the kinetic energy is greatest.
Kinetic energy slowly decreases and at the same ratepotential energy increases as the biker climb up the hill. When the biker is halfway up or down the hill, kinetic energy and potential energy are equal.

At the top of the hill, potential energy is at maximum and kinetic energy is zero. As the biker comes down the hill, kinetic energy increases and potential energy decreases.

Option A - kinetic energy is low
Option B - kinetic energy is zero
Option D - is totally wrong.

A bike going down a hill has the most kinetic energy. The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as work needed to accelerate a body of given mass from its rest to stated velocity. While accelerating, the form maintains kinetic energy.

The same amount of energy of work is done by the body when decelerating from its current speed to a state of rest. The kinetic energy that has been converted into gravitational potential energy can be released by freewheeling down the side of the hill. Work is done on an object by applying force, and the object speeds up and thus gains kinetic energy.