Relative velocity in 2-D

Relative velocity problems are handled in a similar way in two dimensions - it's just harder to add and subtract the vectors because you have to use components.

Let's change the 1-D example to 2-D. The truck still moves at 40 km/hr west, but the car turns on to a road going 40 degrees south of east, and travels at 30 km/hr. What is the velocity of the car relative to the truck now?

The relative velocity equation for this situation looks like this:

vCT = vCG + vGT