Homework 3

James Bond (90 kg), out tted with perfectly matching skis and skiware, is at the top of a steep slope that

a secret spy like him can easily handle. He lets himself go from rest and smoothly slides down the h = 15 m

high hill. A big parking lot lies at the bottom of the hill. Since the parking area has been cleared of snow,

the friction between the ground and the skis brings our hero to a halt at point D, located at a distance

d = 12 m from point C. The descent can be considered frictionless. Take the potential energy to be zero at

the bottom of the slope.

(a) What is the mechanical energy of James Bond at points A and D?

(b) Determine the speed of Bond at position B abd C.

(c) What is the work done by friction in the parking lot?

(d) Find the magnitude of the average friction force.

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