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Q.

Four blocks A, B, C, and D of masses 6 kg, 3kg, 6kg and 1kg respectively are connected by light strings passing over frictionless pulleys as shown in the figure. The strings P and Q are horizontal. The coefficient of friction between the horizontal surface and the block B is 0.2 and the blocks A and B move together.

If the system is released from rest then the tension in the string Q is (Acceleration due to gravity = 10 ms-2)

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a

24 N

b

48 N

c

6 N

d

12 N

answer is C.

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Detailed Solution

As the blocks A and B move together, 

a=60-10-(0.2(90))16=2ms-2

For D,

T-mg=ma⇒T=12N

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