A 75 kg person escapes from a burning building.

Physics
Tutor: None Selected Time limit: 1 Day

He does so by jumping from a window 25m above a catching net. Assuming that air resistance exerts a 95N force on the person during the fall, determine the person's velocity just before hitting the net.

Oct 12th, 2015

Thank you for the opportunity to help you with your question!

F=m(g-a)

a=g-F/m = 9.8 - 95/75 = 9.8-1.27 = 8.53 m/s^2

v = sqrt(2a*l)=sqrt(2*8.53*25)=20.65 m/s

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 12th, 2015

This is the last question I'll be needing, I hope you'll be willing to answer. Thank you so much for your help; you have no idea how much help I needed.


Tim is a 90 kg winger on the hockey team and he pushes against the boards in a hockey rink with a force of 35N and recoils. What acceleration does Tim experience? You may ignore friction?

Oct 12th, 2015

F=ma

a=F/m=35N/90kg=0.39 m/s^2

Oct 12th, 2015

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Oct 12th, 2015
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