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Questions  

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

detailed solution

Correct option is C

where M = Mass of the block on which force F is applied. and m = Mass of the upper block.

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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


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