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3. A cart with frictionless bearings is initially at rest at the foot of a hill. A student pushes the cart so that the

3. A cart with frictionless bearings is initially at rest at the foot of a hill. A student pushes the cart so that the cart has a potential energy of 460 J and a kinetic energy of 260 J upon reaching the top of the hill. How much work did the student do on the cart? h m

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