A 2.00 kg ball is thrown upward at some unknown angle from the top of a 20.0 m high building if the initial magnitude of the velocity of the ball is 20.0 m/s. What is the magnitude of the final velocity when it strikes the ground? (ignore air resistance.)

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.