(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A pair of masses M1, M2 is suspended vertically by a pair of spring, with spring constant k1, k2. ( see the attachment for the picture)

a.A downward force F is applied to bottom mass. Find the downward displacements d1 and d 2 of the equilibrium positions of the Mass M1and M2 due to the force. Note that effect of gravity is already taken into account in determing the equilibrium positions.

b.At time t =0, the downward force is removed. What are the equation of motion and initial conditions that determine the displacements d1(t) and d2(t) for t greater than 0? You need not solve the equations.

2. Relevant equations

m_{2}g=k_{2}x_{2}

k_{2}x_{2}+ m_{2}g+ m_{1}g=k_{1}x_{1}

then i added them, I get 2m_{2}g +m_{1}g=k_{1}x_{1}

F=-kx

3. The attempt at a solution

m_{2}g=k_{2}x_{2}

k_{2}x_{2}+ m_{2}g+ m_{1}g=k_{1}x_{1}

then i added them, I get 2m_{2}g +m_{1}g=k_{1}x_{1}.

after this, I hav no idea how to solve this! please help!

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# Homework Help: Spring problem

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