1) The position of a mass point moving on a straight line is given by the following equation, x(t) = (t 1)(t 2)(t-3), where t is time, measured in seconds, and x(t) is the position of the object at time t, measured in meters. a) At what time(s) is the velocity of the object equal to zero? [3 marks] b) At what time(s) is the acceleration of the object equal to zero? [2 marks]