What Position as a function of time question please help! complicated problem 10 points?would you like to ask?

a 2.00 kg m on a frictionless horizontal track is attached to the end of a horizontal spring whose force constant is 5.00 n/m. the m is displaced 3.00 m to the right from its equilibrium positition and then released, which initiates simple harmonic motion. (a) what is the force (magnitude and direction) acting on the m 3.50 s after it is released? (b) how many times does the m scilate in 3.5 s?