A skier of mass 104 kg starts from rest at the top of the ski slope of height 10

Question

A skier of mass 104 kg starts from rest at the top of the ski slope of height 100 m shown in the figure below. If the total work done by friction is ?4.7 104 J, what is the skier's speed when he reaches the bottom of the slope? (Figure not drawn to scale.)

______m/s

A skier of mass 104 kg starts from rest at the top of the ski slope of height 100 m shown in the figure below. If the total work done by friction is ?4.7 104 J, what is the skier's speed when he reaches the bottom of the slope? (Figure not drawn to scale.) ______m/s

Explanation / Answer

conserving energy: mgh = 0.5mv^2 + Wf or, v^2 = 2gh - 2Wf/m = 1056.15 v = 32.5 m/s

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