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physics 231

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A 84-kg fireman slides down a 4-m pole by applying a frictional force of 416 N against the pole with his hands. If he slides from rest, how fast is he moving once he reaches the ground?

  • physics 231 -

    Fn = mg - Fk,
    Fn=84*9.8 - 416 = 407.2 N.=Net force.

    Fn = ma,
    a = Fn/m = 407.2 / 84 = 4.85 m/s^2.

    Vf^2 = Vo^2 + 2a*d,
    Vf^2 = 0 + 9.7*4 = 38.78,
    Vf = 6.23 m/s.

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