1. The problem statement, all variables and given/known data A force of magnitude 39.5N stretches a vertical spring a distance 0.256m. a) What mass must be suspended from the spring so that the system will oscillate with a period of 1.10s? got 4.73kg b) If the amplitude of the motion is 5.00×10−2m and the period is that specified in part (a), where is the object at a time 0.320s after it has passed the equilibrium position, moving downward? (Take the upward direction positive.) c) What force (magnitude) does the spring exert on the object when it is a distance 2.50×10−2m below the equilibrium position, moving upward? d) direction of part c's force? 2. Relevant equations T = 2pi/omega omega = 2pi/T x = Acos(omegat+phi) F = kx F/x = k = 154.3N T = 2pi(m/k)^1/2 3. The attempt at a solution b) x = Acos((2pi/1.10)*.320) = .04998 ~ .05m - incorrect c) 1. F = kx = (154.3)(2.5x10^-2) = 3.9 - incorrect 2. F = k[tex]\int[/tex]xdx (from 5x10^-2 to 2.5x10^-2) = -.1446m - incorrect I don't know why the equations aren't working for me, any help is appreciated.