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Posted by on Tuesday, December 18, 2012 at 11:02pm.

A 83 kg person escapes from a burning building by jumping from a window 21 m above a
catching net.
The acceleration of gravity is 9.81 m/s
2
.
Assuming that air resistance is simply a
constant 92 N force on the person during the
fall, determine the person’s velocity just before hitting the net.
Answer in units of m/s

  • physics - , Wednesday, December 19, 2012 at 1:25am

    Kinetic energy at net = (potential energy loss) - (work done against friction)

    (1/2)M V^2 = M g H - 92*21

    H = 21 m
    M = 83 kg
    g = 9.81 m/s^2

    Solve for V.

  • physics - , Friday, June 7, 2013 at 6:08pm

    27.8m/s2

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