A 70 kg man leaps vertically into the air from a crouching position. To take the leap the man pushes the ground with a constant force F to raise…

A $\displaystyle 70$ kg man leaps vertically into the air from a crouching position. To take the leap the man pushes the ground with a constant force F to raise himself. The center of gravity rises by $\displaystyle 0.5$ m before he leaps. After the leap the c.g. rises by another $\displaystyle 1$ m . The maximum power delivered by the muscles is : (Take $\displaystyle \mathrm{g}=10 \mathrm{~ms}^{-2}$ ).