Priyanka B Solutions for Chapter: Work and Energy, Exercise 4: Assignment

Name the type of energy possessed by a stretched rubber band.

Which type of energy is possessed by a cricket ball, just before being caught by a fielder?(potential energy/kinetic energy)

State the transformation of energy when: Head of a nail is hammered hard and it becomes hot.

Derive an expression for gravitational potential energy.

A skier of mass $50 \text{kg}$ stands at $\text{'}A\text{'}$ at the top of a ski jump. He takes off at $\text{'}A\text{'}$ for his jump to $\text{'}B\text{'}$. Calculate the change in his gravitational potential energy between $\text{'}A\text{'}$ and $\text{'}B\text{'}$.

The velocity of a body moving in a straight line is increased by applying a constant horizontal 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.

Show that the total mechanical energy remains conserved during the free fall motion of a stone.

Derive an expression for kinetic energy of a body.