Two particles A and B start simultaneously from the same point and move in a horizontal plane. A has an initial velocity u 1 due east and acceleration a 1 due north. B has an initial velocity u 2 due north and acceleration a 2 due east.
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(a, c, d) 
, 
, 
, 
, 
(S P/C ) X = – 16, (S P/C ) Y = + 2.4, (S P/C ) Z
= – 3.2K
Z direction
= – 3.2 = – 
gt 2 ⇒ t = 
⇒ t = 0.8s
= – 16 = – v × t ⇒ v = 20 m/s
= – 2.4 = – uxt ⇒ u = 3 m
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