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In the system shown in the figure AB and...

In the system shown in the figure AB and CD are identical elastic cords having force constant K. The string connected to the block of mass M is inextensible and massless. The pulley is also massless. Initially, the cords are just taut. The end D of the cord CD is gradually moved up. Find the vertical displacement of the end D by the time the block leaves the ground.

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The correct Answer is:
`(5Mg)/(2K)`
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