Posted by Sasha on Thursday, November 12, 2009 at 8:12pm.
Use conservation of energy to calculate the velocity at the ground with no friction.
V = sqrt (2 g H) = 15.97 m/s
If there is a lower velocity of 8.0 m/s, which is about 1/2 of the frictionless value, than about 3/4 of the available potential energy has been lost to friction.
Friction energy loss = (3/4)*M g H = ?
For the average force, solve
(friction energy loss)= (average force) x (13.0 m)
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