Give a reason for the following:

(a) A bullet is released on firing the pistol.

(b) An arrow moves forward when released from the stretched bow.

(c) Winding the spring of a toy car makes it to run on the ground.

(d) Falling water from a dam generates electricity.

(e) Winding the spring of our watch, the hands of the watch movement.

(a) The chemical energy of gun powder is converted into kinetic energy of the bullet.

 (b) The elastic potential energy in a stretched bow is converted into kinetic energy of the arrow.

 (c) The potential energy of a spring is converted into kinetic energy of the toy.

 (d) The kinetic energy of water is converted into electric energy.

 (e) The potential energy of spring due to its windings is converted into mechanical energy of the watch.