students mass 63kg falls freely from rest and strikes ground.During collision w/

Question

students mass 63kg falls freely from rest and strikes ground.During collision w/ground, he comes to rest in 0.040s. Averageforce exerted on him by the ground is +18000N. Upward is +direction. From what height did the student fall? Assuming onlyforce acting on him during the collision is that due to theground. How would I set up the problem? What equations would Iuse? Thank you. students mass 63kg falls freely from rest and strikes ground.During collision w/ground, he comes to rest in 0.040s. Averageforce exerted on him by the ground is +18000N. Upward is +direction. From what height did the student fall? Assuming onlyforce acting on him during the collision is that due to theground. How would I set up the problem? What equations would Iuse? Thank you.

Explanation / Answer

force=change in momentum/time 18000=63*v/0.040 so v=11.42m/sec but we have v=2gh v2=2gh so h=v*v/2g=11.42*11.42/2*9.8=6.65m

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