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a) Determine the function for x(t), the displacement from equilibrium position as a function of time.

I got this to be x(t) = .25sin(8t)

b) What is the period T, of the subsequent oscillations?

I got the period to be .785 sec

I NEED HELP WITH C AND D, WHAT DO I DO?

c) What is the kinetic energy of the mass 4.0 sec after it collides with the spring?

d) What force is exerted by the spring on the block at t=1.2 sec? Which way is the block moving? Explain