Consider three blocks A,B and C. Block A is placed on block B, which is placed on block C and block C is placed on the ground. Normal reaction between blocks B and C is three times of that between blocks A and B. Normal reaction between block C and ground is two times of that of between blocks B and C. Possible values of the masses of blocks A , B and C respectively are :

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5 kg, 15 kg and 10 kg

5 kg, 10 kG and 15 kg

5 kg, 15 kg and 30 kg

5 kg, 30 kg and 60 kg

answer is B.

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Detailed Solution

NAB=mAgNBC=mA+mBg=3mAg⇒mB=2mANCG=mA+mB+mCg=6mAg⇒mC=3mA⇒ If mA=5kg,then mB=10kg and mC=15kg

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