A 5.00-kg block placed on a frictionless and horizontal tabletop is attached to a spring (k=200 N/m), which can be stretched or compressed. The other end of the spring is anchored to the wall (see the figure above). The equilibrium position is marked at zero. A person moves the mass out to x=20.0 cm and releases it from rest. The mass oscillates in SHM.

A: Calculate the period of the SHM?

B: Calculate the speed of the block when it passes the equilibrium point?

C: Find the position velocity, and acceleration of the block at t=3.00 s?