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A block of mass M placed inside a box de...

A block of mass M placed inside a box descends vertically with acceleration 'a'. The block exerts a force equal to one-fourth of its weight on the floor of the box. The value of 'a' will be

A

`(g)/(4)`

B

`(g)/(2)`

C

`(3g)/(4)`

D

g

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