The example that demonstrates kinetic energy is a wave crashing on the shore. Kinetic energy is the energy of motion, and a wave in motion embodies that energy as it moves towards the shore.
The other options involve potential energy or are stationary:
- A stretched-out rubber band has potential energy due to its tension.
- A car parked in the parking lot is not in motion and therefore does not have kinetic energy.
- A rock sitting at the top of a hill has gravitational potential energy due to its elevated position.