Homework Help: physics 231

Posted by sanya on Thursday, February 9, 2012 at 3:16pm.

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 - Henry, Saturday, February 11, 2012 at 3:56pm
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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