In an elastic collision, a rigid sphere moving with velocity v1 collided head-on with another sphere of equal mass moving toward it, as shown in the picture. The second sphere had a velocity 2v1. What was the change in velocity of the first sphere after the collision?
A) v1, moving from left to right
B) v1, moving from right to left
C) 2v1, moving from left to right
D) 2v1, moving from right to left

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.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide