When the man stopped at the bottom he had minimal potential energy and no kinetic energy.
He had gone down 9.5 meters
so the total energy he lost was m g h = 650*9.8*9.5
The net is also not moving then so all that potential the man had went into potential energy of the net. When the net starts the man moving it will have to use up that potential so that is the max.
A 650N man jumps out of a window into a fire net 8m below. The net stretches 1.5m before bringing the man to rest and tossing him back into the air. What is the maximum potential energy of the net compared to its unstretched potential energy?
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