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Q.

The block shown in figure is in equilibrium. Find acceleration of the block just after the string is cut.

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a

3g/5

b

4g/5

c

4g/3

d

None of these

answer is C.

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Detailed Solution

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 T=Kxsin53 (before cutting), kxCos53=mg 

kx35=mg kx=5mg3

 after cutting  a=kxsin53m a=5mg345m=4g3

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