The expression 75 meters per second southeast best describe velocity as it involves magnitude and direction. From the example, the magnitude is 75 m/s (also know as speed) and the direction is southeast. Both are needed to define velocity — usually this happens to moving vehicles or automobiles.
When two magnets are brought together, the opposite poles will attract one another, but the like poles will repel one another. This is similar to electric charges. Like charges repel, and unlike charges attract.