Car B is traveling along the curved road with a speed of while decreasing its sp

Question

Car B is traveling along the curved road with a
speed of while decreasing its speed at . At this
same instant car C is traveling along the straight road with a
speed of while decelerating at . Determine the
velocity and acceleration of car B relative to car C.
for pic plzz check dis website
http://www.cramster.com/answers-sep-11/mechanical-engineering/determine-velocity-acc-car-traveling-curved-road-speed-15_1480728.aspx?rec=0
i cannot understand velocity Cartesian coordinate make angle 60
vB = [15 cos 60° i - 15 sin 60° j]
thnx

Explanation / Answer

Vb is in the direction with a 60 degree from x (clockwise), that's why vB = 15 cos 60° i - 15 sin 60° j

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