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Q.

A block of mass 4kg is placed on another block B of mass 5kg and the block B rest on smooth horizontal table. If the maximum force that can be applied on A so that both the blocks move together is 12N.The maximum force that can be applied to B for the blocks to move together will be

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a

30N

b

27N 

c

48N

d

25N

answer is C.

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Detailed Solution

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Maximum force on A=frictional force between the surface =12N  
Therefore maximum acceleration
aMax=124=3ms-2 ∴FMax=9×3=27N

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