9.???Explain the following:

???????(a) An object increases its energy when raised through a height.

???????(b) Energy is neither created nor destroyed then from where dowe get energy.

???????(c) When we push the wall, the wall does not move and no work is done.

10.???State and explain one example where (i) Kinetic energy is present in a body and is used; and (ii) Potential energy is present in a body is used.