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safari File Edit View History Bookmarks window Help HW 10 - mechanics Student Center 0/4 points | Previous Starting from rest, a 91-kg firefighter slides down a fire pole. The average frictional force exerted on him by the pole has a magnitude of 820 N, and his spee 7.75 CJ10 6.P.053. d at the bottom of the pole is 3.0 m/s. How far did he slide down the pole? Additional Materials Section 6.6 My Notes O Ask Your Tea O 2/4 points | Previous Answers CJ10 6.P056. In the sport of skeleton a participant jumps onto a sled (known as a skeleton) and proceeds to slide down an icy track, belly down and head first. The track has sixteen turns and drops 78 m in elevation from top to bottom.

Explanation / Answer

Let the distance slide is s meter,By the work energy theorem
=PE(initial) = W(friction) + KE(final)
=mgh = Ff x s + 1/2mv^2
=91 x 9.8 x h = 820 x h + 1/2 x 91 x (3)^2
=(891.8 - 820)h = 409.5
h = 5.70 m

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