The displacement (in meters) of a particle moving in a straight line is given by the equation of motion [math], where [math] is measured in seconds. Find the velocity of the particle at times:

(a) [math].
(b) [math].
(c) [math].
(d) [math].

(a) [math] m/s
(b) [math] m/s
(c) [math] m/s
(d) [math] m/s