Question

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1. A 70.0 kg man jumping from a window lands in an elevated fire rescue net 11.0 m below the window. He momentarily stops when he has stretched the net by 1.50 m. Assuming that mechanical energy is conserved during this process and the net acts like an ideal spring: a) Find the elastic potential energy of the net when it is stretched by 1.50 m. b) Find the effective spring constant k of the net. c) Find the net force on the man when the net is stretched by 1.50 m. d) Find how much the net is stretched if the man is held at rest within it. e) A real fire net should quickly bring a falling person to rest. Assuming the only forces acting are gravity and the spring force, is an ideal spring a good model for a fire net with that behavior? Justily your answer. Answers: a) 8.58kJ b) 7.63 kN/m c) 10.8 kN d) 0.899 m

Answer 1