A 90.0 g ball is dropped from a height of 7.0 m straight down. It rebounds to a height of 6.0 m. What is the impulse that the ball receives from the floor? How much kinetic energy is lost because of the collision with the floor? If the collision with the floor is elastic, what is the height to which that ball rebounds? Show formulas/calculations to support your answer. I have no idea even where to begin with this problem. Could some one maybe give me a hint or two as to how to procede?