Conservation of Energy

In simple harmonic motion, the potential energy is _____, and the kinetic energy is a maximum at the equilibrium point.

Total energy of a body in Simple harmonic motion depends on

If a bullet of mass $80 \mathrm{g}$ moves with a velocity of $700 \mathrm{m} {\mathrm{s}}^{-1}$. It penetrates $25 \mathrm{cm}$ into a target which is not moving and then comes to rest. Find the kinetic energy possessed by the bullet and also the average retarding force offered by the target. 

What is the meaning of law of conservation of energy?

The diagram shows an object released from point $X$ and travelling on a frictionless track. If a heavier object is taken in consideration then:

(i) It will move with a greater speed at $Y$.
(ii) The speed of the object at $M$ is $10 {\mathrm{ms}}^{-1}$.

______ comes in different forms and one form can be converted to another.