A 75 kg person escapes from a burning building.

User Generated

cvathvpxzna

Science

Description

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.

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Explanation & Answer

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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

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