1. The problem statement, all variables and given/known data Two identical masses m1 = m2 = m are connected by a massless spring with spring constant k. Mass m1 is attached to a support by another massless spring with spring constant 2k. The masses and springs lie along the horizontal x-axis on a smooth surface. The masses and the support are allowed to move along the x-axis only. The displacement of the support in the x-direction at time t is given by f (t) and is externally controlled. Write down a system of diﬀerential equations describing the evolution of the displacements x1 and x2 of the masses from their equilibrium positions. 2. Relevant equations 3. The attempt at a solution Is it: mx1'' = -k[x1-f(t)] + k[x2-x1-f(t)] mx2" = -k[x2-x1-f(t)] ? Thanks!