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A cart of mass M1 = 6 kg is attached to a block of mass M2 = 3 kg by a string that passes over a frictionless pulley. The system is initially at rest and the table is frictionless. After the block has fallen a distance h = 1 m:
What is the work Ws done on the cart by the string?
(The cart is on the table connected to a pulley from which a block is hanging)

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