Which of the following is an example of potential energy?
1. Bricks placed on the roof of the house
2. Spring of a clock when it rotates
3. Compressed spring
4. Stored water in an elevated reservoir under the water supply system

A. A raised hammer B. A bullet fired by the gun C. A moving stone D. A rotating wheel

A. Energy released by a moving object B. Energy emitted during mechanical work C. The sum of the kinetic energy and potential energy of an object D. Equal to the rate of work done

A. Force B. Energy C. Friction D. Power

A. Chemical energy B. Potential energy C. Kinetic energy D. Heat energy