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A marble and a massle strand are bound together . The strand is passing through an...

A marble and a massle strand are bound together . The strand is passing through an openning in the surface. The 0.49 kg marble is on frictionless and horizontal suusrface. The marble is, at first revolving at distance of 0.50m from the opening with a velocity of 0.59m/s. The strand is then pulled from bellow, shortening the radius of the circle.Then the marble revolves with a radius of 0.21m. Calculate the change in energy of the marble.

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