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A 60.0-kg skier slides down a hill. She starts with a speed of 0.50 m/s. The friction force is only 10 N. The slope is 80 m long and 50 m high. What is the speed of the skier at the bottom of the hill?

A bungee jumper of mass of 60.0 kg falls off a bridge with zero initial velocity. The bridge is 50.0 m above the river. When the cord is stretched at its maximum (position B), the cord stores 10.0 kJ of elastic potential energy. Neglect air friction. Calc...