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  4. 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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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 :

JEE MainJEE Main 2022Laws of Motion

Solution:

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$m g-N=m a$
$a=g-\frac{g}{4}$
$a=\frac{3 g}{4}$