Help Needed Asap!!! Please! Hi! I need to solve the following problem before tomorrow.. otherwise I'll be in big trouble. :uhh: I've already discussed it with classmates, but they also don't know how to handle it. Please help me! Ok this is the question: A ball A is thrown off a building and at the SAME time a ball B is thrown up from the ground. When both balls hit eachother, they move in OPPOSITE direction and the velocity of ball A is twice the size of B. At which part of the height of the building the balls collided?