Answer the following questions:
Classify each of the following into kinetic energy, potential energy or kinetic energy and potential energy:
(1) A compressed spring (2) The wound up spring of a watch (3) A raised hammer (4) A bullet released from a gun (5) A falling stone (6) The swinging pendulum of a clock (7) The explosive mixture in a bomb (8) wind (9) Water stored in a dam (10) A stretched bow string (11) Running water (12) waterfall.