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A system consists of two identical block...

A system consists of two identical blocks, each of mass m, linked together by the compressed weightless spring of stiffness k, as shown in figure -3.57. The blocks are connected by a thread which is burned through at a certain moment. Find
(a) At what values of initial compression, the inital compression of the spring, the lower block will bounce up after the thread has been burned through
To what height will the centre of gravity of this system will rise if the initial compression of the spring is 7 `mg//k`

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