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Q.

Two blocks A and B of masses 2m and m, respectively, are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in the figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively 

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a

g,g2

b

g2,g

c

g,g

d

g2,g2

answer is B.

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Detailed Solution

After string is cut, free body diagram of block A gives

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2maA=3mg−2mg or aA=mg2m=g2

Free body diagram of block B gives

maB=mg  or  aB=g

 

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