A 28.0 kg block at rest on a horizontal frictionless air track is connected to the wall via a spring.?

The equilibrium position of the m is defined to be at x=0. Somebody pushes the m to the position x= 0.350 m, then lets go. The m undergoes simple harmonic motion with a period of 4.00 s. What is the position of the m 3.400 s after the m is released? Consider the same m and spring discussed in the previous problem. What is the magnitude of the maximum acceleration the mass undergoes during its motion?