You are driving your car East at a speed of 30 m/s on a road along rail tracks. A train is moving West toward you at a speed of 10 m/s. The train blows its horn producing sound of frequency of 600 Hz. (vair = 343 m/s)
What frequency of the horn do you hear in [Hz]?
Suppose you pass the locomotive while the horn is still blowing. What frequency in [Hz] do you hear then?

i dont think you are wrong for wanting to get even with someone who did you wrong.

(i'm an eye for an eye kind of person) but if this person hurt you in a sexual way, i dont suggest doing anything to him. he should be taken to the proper authorities, you could go to jail depending on what you do. if it was something small like your sibling took your spot on the couch, than yea, i would get even with him by taking one of his favorite snacks lol. but i dont suggest you doing anything illegal.