A particle moves along a straight line from a fixed point P for t seconds. Its displacement, s metre, at t seconds after passing is given by [math]s=3t^2-12t+2[/math]. Calculate
(a) the displacements, in meters, of the particle at t=3,
(b) the initial velocity, in ms[sup]-1[/sup], of the particle,[br]
(c) its constant acceleration, in ms[sup]-2[/sup].[br]