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Q.

Coefficient of friction of the 3 kg block and the rough surface is 0.2 and that between the 1 kg and 3 kg block is 0.4. For what minimum value of the applied force P on 3 kg block will make the 1 kg block slide on the 3 kg block?

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a

8 N

b

24 N

c

12 N

d

16 N

answer is B.

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Detailed Solution

if 3 kg and 1 kg blocks move together then the acceleration of the system is P-0.2×1+3g4= P-84that must be maximum acceleration due to pseudo force which balances by μg=0.4g F-84≥0.4g≥4 F-8≥16 F≥24

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