Question

at what acceleration a should the box should secend so that the block of mass M exerts a force mg/4 on the floor of the block​

Answer 1

Explanation:

The block is at rest wilth respect to the box which is accelerated wilth respect to the ground. Hence, the accelerationof theblock with respect to the ground is a downward.The forces on the block are i. Mg downward (by the earth) and

ii. N upward (by the floor).

the equation of motion of the block is therefore

Mg-N=Ma

If N =Mg/4, the above equation gives a=3g4. The block and hence the box should descend with an accelertion 3g4.

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