A body with mass 250g is attached to the end of a spring that is stretched 25cm by a force of 9N. At time t = 0 the body is pulled 1m to the right, stretching the spring, and set in motion with an initial velocity of 5m/s to the left.
(a) Find x(t) in the form C cos(ω0t - a).
(b) Find the amplitude and period of motion of the body.