What would happen if nature does not allow the transfer of energy? Give few examples.

Assertion $\left(A\right)$ : The work done by the electrostatic force is zero when a point charge moves in a circular path around another charge.

Reason $\left(R\right)$ : The dot product of force and displacement vectors gives work done.

A spring of spring constant $\mathrm{K}= 4\mathrm{x}{10}^3\mathrm{N}/\mathrm{m}$ is compressed by $2 \mathrm{cm}$, then determine the potential energy stored in spring. 

A force is applied upon a body of 40 kg then its velocity increases from 1
metre/second to 2 metre/second. Determine work done by the force.

State an example of renewable resource.