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## Homework Statement

A box of mass M is suspended by a spring of stiffness k. A small block of mass m is placed inside the box. If the system is pulled downward by a distance d and then released from rest:

a.) find the force between the bottom of the box and the block as a function of time;

b.) for what value of d does the block just begin to leave the bottom of the box at the top of the vertical osscilations?

## Homework Equations

F(m+M)=mg+ma

x(t)=dcos(ωt)

ω=√(k/(m+M)).

## The Attempt at a Solution

I'm unsure of how to proceed to determine the force of reaction from the equations above that i've worked out.