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A man of mass 81 kg escapes from a burning building by jumping from a window situated 30 m above a catching net. The acceleration of gravity is 9.81...

A man of mass 81 kg escapes from a burning building by jumping from a window situated 30 m above a catching net. The acceleration of gravity is 9.81 m/s2 . If air friction exerts a constant force of 88 N on him as he falls, what is his velocity just before he hits the net?

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