Name the form of energy which a wound-up watch spring possesses.

Name the type of energy (kinetic energy K or potential energy U) possessed in the following cases:

(a) A moving cricket ball

(b) A compressed spring

(c) A moving bus

(d) A stretched wire

(e) An arrow shot out of a bow.

(f) A piece of stone placed on the roof.

Show that the quantity 2K/v² has the unit of mass, where K is the kinetic energy of the body.

Two bodies A and B of masses m and M (M ≫ m) have same kinetic energy. Which body will have more momentum?