a) Consider two aircraft A and B flying at a constant altitude, A travelling due north at 120 ms-1 and B travelling 30 east of north, written N 30 E, at 200 ms-1. Determine, by scaled graphical method, the velocity at which A seems to be travelling to an observer on B? b) Two cars are travelling on horizontal roads in straight lines, car A at 90 km-h1 at N 10 E and car B at 60 km.h at W 60 N. Determine, by scaled graphical method, the velocity of car A relative to car B. c) Verify the graphical results obtained in part a) by calculation.