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Question

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



A
g2
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B
g4
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C
3g4
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D
4g
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Solution

The correct option is C 3g4
FBD of block is as shown 

Mg=N+Ma
Mg=Mg4+Ma
(given N=Mg4
a=3g4
The correct option is (C)

Physics

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