which of the following is an example of kinetic energy transfer?

a large snowball sitting at the top of a hill.
xavier pushing brad down the snowy hill on a sled.
a car parked on a steep hill.
jules sitting in a chair.

Among the examples provided, the one that illustrates kinetic energy transfer is:

Xavier pushing Brad down the snowy hill on a sled.

This is kinetic energy transfer because when Xavier pushes Brad, he is applying a force that sets Brad into motion down the hill, converting potential energy into kinetic energy as the sled gains speed.