An object of mass 100 grams hangs from a long spring. When pulled down 10 cm from its equilibrium position and released from rest, it vibrates with a period of 2 seconds.
(a) What is the speed of the object as it passes through the equilibrium position?
b) What is the acceleration of the object when it is 5 cm above the equilibrium position?

c) When it is moving upward, how long does it take for the object to move from a point 5 cm below its equilibrium position to a point 5 cm above its equilibrium position?