Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy, you spend, going?

Ratio of potential energies of body A and body B will be

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. 

State an example of renewable resource.