Particle P moves in a straight line such that, t seconds after passing through a fixed point Q its velocity V m/s given by the equation V = 3t -15t+18. Find a) The values of t for which P is instantaneously at rest. b) An expression in terms of t for the distance P from O after t seconds. c) The total distance travelled by P in the first 4 seconds after passing point O. (3 marks) (2 marks) (2 marks)