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A 50 kg skier starts from rest at a height ? = 40? above the end...

A 50 kg skier starts from rest at a height ? = 40? above the end of a launching ramp. Determine the launch speed of the skier (at the end of the ramp) if

(a) there is no friction, or

(b) If friction does -3000 J of work on the skier

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