Question

I give medals!

You walk with a velocity of 2 m/s north. You see a man approaching you, and from your frame of reference he has a speed of 3 m/s to the south. What is the velocity of the man from the frame of reference of a stationary observer?

Answer 1

Do you know what the "velocity of approach" is?

Answer 2

basically, the person approaching you feels like he's going at 3 m/s because you are approaching him at 2m/s. If you stop moving, your speed decreases by 2m/s to drop to 0. That means the person that was going south was actually going at 1m/s.

3m/s -2m/s = 1 m/s