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Question

With what acceleration 'a' should the box in figure descend so that the block of mass M exerts a force Mg4 on the floor of the box?


A
g4
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B
g2
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C
3g4
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D
4g
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Solution

The correct option is D 3g4

F.B.D. of block in the frame of the box is as shown
Mg=N+Ma
Mg=Mg4+Ma
a=3g4
(c)

Physics

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