What type of energy is stored in the following cases?

(a) A stretched rubber band

(b) A compressed spring

(c) An extended spring (or slinky)

(d) An object at a certain height

(e) A stretched bow

How do green plants produce food? Where do they get the energy from?

The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of motion. Prove that the increase in kinetic energy of the body is equal to the work done by the force on the body.

(a) Is it possible that a force is acting on a body but still work done is zero? Explain giving one example.

(b) Two bodies of equal masses move with uniform velocities $v$ and  $3v$ respectively. Find the ratio of their kinetic energies.

(a) Define 1 watt.

(b) An electric bulb of $60 \mathrm{W}$ is used for $6$ hours per day. Calculate the units of energy consumed in one day by the bulb.

Define work. Give its SI and CGS units. What is the relationship between these units?