Two blocks are connected by a spring. The combination is suspended, at rest, from a string attached to the ceiling, as shown in the figure. The string breaks suddenly. Immediately after the string breaks, if the initial acceleration of the upper block is found to be ng/2. The value of n is_______

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answer is 3.

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Detailed Solution

T=Kx+2mg ....(1)Kx=mg .....(2)T=3mg ......(3)After cutting T = 0downward net force on 2m block becomes 3mg∴ a=3mg2m=3g2

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