1. The problem statement, all variables and given/known data A brick of mass 6 kg hangs from the end of a spring. When the brick is at rest, the spring is stretched by 3 cm. The spring is then stretched an additional 4 cm and released. Assume there is no air resistance. Note that the acceleration due to gravity, g, is g=980 cm/s2. Set up a differential equation with initial conditions describing the motion and solve it for the displacement s(t) of the mass from its equilibrium position (with the spring stretched 3 cm). 2. Relevant equations my'' + by' + ky = Fexternal y(0) = y0 + initial displacement y'(0) = V0 m = mass b = damping constant k = spring constant F = -kx 3. The attempt at a solution I get: k = 19.6N/cm y(0) = -4cm y'(0) = 0 I'm assuming b = 1 since it wasn't given. 6y'' + y' + 19.6y = 0, solving for the initial conditions . . . y(x) = e^(-.08333x)(-0.1846sin(1.8055x)-4cos(1.0855x)) But that comes back as incorrect. I had a similar problem and didn't have any trouble so I'm having a hard time seeing where I went wrong with this one.