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a.) A 49-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when...

a.) A 49-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.1 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

b.) A skier of mass 60 kg is pulled up a slope by a motor-driven cable.

(a) How much work is required to pull him 80 m up a 30° slope (assumed frictionless) at a constant speed of 1.7 m/s? kJ

(b) What power (expressed in hp) must a motor have to perform this task? hp

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