1. The problem statement, all variables and given/known data "Two light springs have spring constants k1 and k2, respectively, and are used in a vertical orientation to support an object of mass m. Show that the angular frequency of small amplitude oscillations about the equilibrium state is [(k1 + k2)/m]^1/2 if the springs are in parallel, and [k1 k2/(k1 + k2)m]^1/2 if the springs are in series. " 2. Relevant equations f = -kx w = (k/m)^1/2 frequency = w/(2 * pi) 3. The attempt at a solution So I set up my fnet for the parallel one m * x'' = - (k1x + k2x) since in the parallel feature there are two distinct springs exerting two distinct forces however dividing through I'm left with x'' = - (k1x + k2x)/m I'm not quite sure how to use x'' to get to angular frequency or how to remove the negative sign.