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can somebody help me how to do this exercise. i dont know how to start....

exercise:

a van is travelling north at a speed of 28m/s.after turning a corner it is heading 40° east of north at 25 m/s.

work out the change in velocity of the van.

first of all what i don't understand is what exactly do they mean with east of north? do they mean northeast?

i tried to work out the resultant but thaats not possible as i cant use pythagoras as there's no right angle.

i would be really happy to get some help

thanks in advance :)