A body slides down a curved track which is one quadrant of a circle of radius R. If it starts from rest at the top of the track and there is no friction, find the speed at the bottom of the track is R equals 5 m.
The scale of a certain spring balance reads 1200 N when the spring is stretched 0.1m. (a) What is the potential energy of the spring when it is stretched 0.1m and when it is stretched 0.5 m? (b) What is the potential energy when a 50 kg mass hangs from the spring?
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