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physics

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a 75 kg person escapes from a burning building by jumping from a window 30 m above a catching net. Acceleration due to gravity is 9.81 m/s^2. Assuming air resistance is simply a constant 96 N force on the person during the fall, determine the person's velocity just before hitting the net. answer in m/s.

  • physics - ,

    so Fg = 75*9.81 = 735.75 N

    Fnet = ma

    Fair - Fg = ma
    96 - 735.75 = 75 * a
    a = -8.53 m/s2

    Vf2 = Vo2 +2ax
    Vf2 = 0 + 2(-8.53)(-30)
    Vf2 = 511.8
    Vf = -22.63 m/s //neg b/c downward direction

  • physics - ,

    DO NOT MAKE THE ANSWER NEGATIVE ^^^^^^^ This is velocity NOT speed

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