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18 September, 19:51

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 73.0 kg man just before contact with the ground has a speed of 6.46 m/s. In a stiff-legged landing he comes to a halt in 2.07 ms. Calculate the average net force that acts on him during this time

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  1. 18 September, 23:16
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    The man comes to halt due to reaction force acting on him in opposite direction. If R be the reaction force

    impulse by net force = change in momentum

    Net force = R - mg, mg is weight of the man.

    (R-mg) x 2. 07 x 10⁻³ = 73 x 6.46 - 0

    R - mg = 227.81 x 10³

    Average net force = 227.81 x 10³ N.
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