Suppose that small ball is attached to one end of a thin massless thread, whose other end goes through a small hole in the middle of a leveled, frictionless table. You pull the thread slowly down through the hole while the ball is revolving on the table around the hole. Show that the work you do is the same as the energy the ball gains.

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Suppose that small ball is attached to one end of a thin massless thread, whose other end goes through a small hole in the middle of a leveled, frictionless table. You pull the thread slowly down through the hole while the ball is revolving on the table around the hole. Show that the work you do is the same as the energy the ball gains.

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