4/A particle P starts to move from a fixed point O along a straight line. Its velocity, v ms', is given by v = 16- 2t- 3t, where t is the time in seconds after the particle has left O. Particle Q moves in the same straight line, starting from O with a velocity of 6 m s at the instant the particle P passes through point O. Particle Q moves with an acceleration of a ms² which is given by a = 4t – 8. Find (a) the velocity of particle P when it passes through point O for the first time, (b) the time when particle P reverses its direction, (c) the total distance travelled by particle Pin the first 3 seconds,

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