A uniform chain of mass m and length l is kept on a smooth horizontal surface such that 1/4th of its length is hanging from the edge of the table. If it slides down, the change in kinetic energy when hanging length becomes 3l4 will be
A
mgl4
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B
mgl2
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C
mgl32
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D
9mgl32
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Solution
The correct option is Cmgl4
The center of mass of chain has descended through l8 to 3l8
The increase in potential energy will be gain in kinetic energy :