Some Other Examples of Potential Energy

Name the type of energy (kinetic or potential) possessed by the water flowing in a river.

Name the type of energy (kinetic or potential) possessed by a stone at rest on the top of a building.

Name the form of energy stored in a wound up spring of a watch.

The energy stored in water of a dam is the kinetic energy.

A body when acted upon by a force of $10 \mathrm{kgf}$  moves to a distance $0.5 \mathrm{m}$ in the direction of force. Find the work done by the force. Take $1 \mathrm{kgf}=10 \mathrm{N}$.

Two bodies of same masses are placed at heights $\mathrm{h}$ and  $2\mathrm{h}$. Compare their gravitational potential energy.     

A force of $30 \mathrm{N}$ acts on a body and moves it through a distance of  $5 \mathrm{m}$ in the direction of force. Calculate the work done by the force.

A cyclist double his speed. How will his kinetic energy change: increase, decrease or remain same ?

Name the type of energy (kinetic or potential) possessed by a compressed spring.

Can a body possess energy even when it is not in motion ? Explain your answer with an example.

Give one example of a body that has potential energy due to its elongated, stretched state.