1. The problem statement, all variables and given/known data Jason hits a volleyball so that it moves with an initial velocity of 6.0 m/s straight upward. If the volleyball starts from 2.0 m above the floor, how long will it be in the air before it strikes the floor? 2. Relevant equations y=-2.0m,Vi=+6.0 m/s a=-9.81m/s^2 vf^2=vi^2+2ay. then just put the numbers in it. 3. The attempt at a solution I don't understand why the displacement here is -2.0m? I don't think it can be used in solving the problem because 2.0m is not the distance that the ball traveled, but just 2.0m above the floor? What's the significance of it?