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COM of Center of Masses

Three blocks ...

Question

Three blocks are placed one over the other as shown in the figure. The minimum force needed to cause the motion in any part of the system is

A

16 N

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B

20 N

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C

30 N

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D

46 N

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Solution

The correct option is B 20 N
If F = 20N, then frictional force between A & B will be 20N. If F is increased beyond 20N, then A & B will slide on the lower surface with same acceleration while C will remain at rest.

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