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Q. A projectile is launched perpendicularly upward from a planet of mass M; and radius R; its initial speed is twice the escape speed. Derive an expression for its speed as a function of the distance from the center of the planet.

Q. A skier of mass 70.00 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 60 m up a 30 degree slope (supposed frictionless) at a steady speed of 2.00 m/s? (b) What power must a motor have to perform this task?

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