A particle moves along the x axis. It is initially at the position 0. 270 m, moving with velocity 0. 140 m/s and acceleration 20. 320 m/s2. Suppose it moves as a particle under constant acceleration for 4. 50 s. Find (a) its position and (b) its velocity at the end of this time interval. Next, assume it moves as a particle in simple harmonic motion for 4. 50 s and x 5 0 is its equilibrium position. Find (c) its position and (d) its velocity at the end of this time interval.