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Q.

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

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a

g

b

g2

c

3g4

d

g4

answer is C.

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mg – N = ma  
a=g−g4
a=3g4

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