physics
posted by John .
A particle moves along the x axis. It is initially at the position 0.280 m, moving with velocity 0.080 m/s and acceleration 0.240 m/s2. Suppose it moves with constant acceleration for 3.10 s.
(a) Find the position of the particle after this time.
(b) Find its velocity at the end of this time interval.
Next, assume it moves with simple harmonic motion for 3.10 s and x = 0 is its equilibrium position.
(c) Find its position.
(d) Find its velocity at the end of this time interval.

a and b require kinematic questions and are therefore easy. anyone know how to do c and d?