(CIE 0606/2021/m/12/Q5)
In this question all lengths are in kilometres and time is in hours. Boat A sails, with constant velocity, from a point O with position vector (00). After 3 hours A is at the
point with position vector (−129.)
(a) Find the position vector, →OP, of A at time t. [1]
At the same time as A sails from O, boat B sails from a point with position vector (126), with constant velocity (−58).
(b) Find the position vector, →OQ, of B at time t. [1]
(c) Show that at time t,|→PQ|2=26t2+36t+180. [3]
(d) Hence show that A and B do not collide. [2]
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