Solved: Circular motion by a string, Physics

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Circular motion by a string

Assignment:

Mass m whirls on a frictionless table, held to circular motion by a string which passes through a hole in the table. The string is slowly pulled through the hole so that the radius of the circle changes from L1 to L2.

Show that the work done in pulling the string equals the increase in kinetic energy of the mass.

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Physics: Circular motion by a string

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