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With what acceleration 'a' should the bo...

With what acceleration 'a' should the box of figure moving up so that the block of mass `M` exerts `a` force `7Mg//4` on the floor of the box?

A

`g//4`

B

`g//2`

C

`3g//4`

D

`4g`

Text Solution

Verified by Experts

The correct Answer is:
C
FDB of `M` : If `M`exert force `F=7Mg//4` on floor, then from third law floor also exerts force `F` on box in upward direction.
`F-Mg=Ma`
implies `(7Mg)/(4)-Mg=Ma` implies `a=(3g)/(4)`
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