A 40.0-N force stretches a vertical spring 0.250 m.
(a) What mass must be suspended from the spring so that the system will oscillate with a period of 1.00 s?
(b) If the amplitude of the motion is 0.050 m and the period is that specified in part (a), where is the object and in what direction is it moving 0.35 s after it has passed the equilibrium position moving downward?
(c) What force (magnitude and direction) does the spring exert on the object when it is 0.030 m below the equilibrium position, moving upward?