Jump off a wall of a height h. (a) with what speed v, will you hit the ground? A

Question

Jump off a wall of a height h. (a) with what speed v, will you hit the ground? Assume you of gravity.) One way to avoid injury is to bend your knees upen landing to reduce the force of the impact (b) Suppose that the time interval starting when your feet fr t touch the gund unti you stap is . Cal iate the (average) fet fare atrg on you drng tat intene. Aear, express anwer" (e) Suppose h 1 m. If you land stm-legged, the time it takes you to stop mey be as short as 2 you in the two cases. First, what is your mass? Average net force if you land stiff-legged 7 Average net force if you bend your knees 3099 d) The net force on you while you are stopping incluces both the ferce of gravity and the force of the ground pushing wp. which of ehese does you the linoury? ma, white yau bend your knes, might be as long as 0.1s. Calicuate the avernge o force of ground pushing up (e) For the two cases in part (c), calculate the upward Upward force the ground exerts on you it you land st.fegged 1s5037 force the ground exerts on you. Upward force the ground exerts on you f you bend your knees 3785 3785

Explanation / Answer

c) F = sqrt(2*g*h)*m/delT

h = 1m

For a stiff legged landing, delT = 2ms

F = 175715.12 N

For a bent landing, delT = .1sec

F = 3514.30 N

e) For stiff landing, upward force F = 175715.12 N

For bent landing, upward force F =  3514.30 N

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