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Block X and Y are connected by a string that passes over a pulley, as shown...

Block X and Y are connected by a string that passes over a pulley, as shown in the firgure. Block Y has more mass than Block X. The string and pulley have negligble mass, and the pulley rotates with negligible friction. After the block are released from rest, what happens to the mechanical energy Fmech of the system consisting of the two block and Earth?
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Hera T is tension of string

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