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A 4 kg block A is placed at the top of 8...

A 4 kg block A is placed at the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 20 N is applied on A. The maximum horizontal force F required to make both A & B move together is

A

36 N

B

5 N

C

40 N

D

60 N

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The correct Answer is:
C
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