Two toy cars A and B of masses 500 g and 200 g respectively are moving with the same speed. Which of the two has greater kinetic energy?

A cyclist doubles his speed. How will his kinetic energy change: increases, decreases or remains the same?

Name the type of energy (kinetic or potential) possessed by the following:

(i) A moving cricket ball.

(ii) A stone at rest on the top of a building.

(iii) A compressed spring.

(iv) A moving bus.

(v) A bullet fired from a gun.

(vi) Water flowing in a river.

(vii) A stretched rubber band.

State the energy changes that occur in the following:

(i) The unwinding of a watch spring.

(ii) Burning coal while operating a steam engine

(iii) Lighting of a torch bulb.

(iv) An electric generator (or dynamo).