Waterslides are nearly frictionless, hence can provide bored students with high-

Question

Waterslides are nearly frictionless, hence can provide bored students with high-speed thrills (see the figure). One such slide, Der Stuka, named for the terrifying German dive bombers of World War II, is 72.0 feet high (21.9 m), found at Six Flags in Dallas, Texas, and at Wet'n Wild in Orlando, Florida. (a) Determine the speed of a 52.0-kg woman at the bottom of such a slide, assuming no friction is present. (Assume her initial speed vi = 0.)
m/s CORRECT ANSWER

(b) If the woman is clocked at 16.1 m/s at the bottom of the slide, find the work done on the woman by friction.

_______J NEED THIS ONE

Explanation / Answer

The difference in kinetic energy between frictionless and with friction is equal to the work done by friction, which would be negative work:

W = KE = (1/2)(52)(16.12-20.752) =

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