1. The problem statement, all variables and given/known data 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? 2. Relevant equations F(m+M)=mg+ma x(t)=dcos(ωt) ω=√(k/(m+M)). 3. 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.