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A car is heading northwest at 80 km/h and a truck is heading east at 60 km/h. Determine the velocity of the truck relative to the car.

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Vrel = Vtruck - Vcar
That must be treated as a vector equation. Break it up into x (east) and y (north) components.

Vrel,x = 60 -80 sin45 = 3.4 km/h
Vrel,y = 0 - 80 cos 45 = -56.6 km/h

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