The Phenomenon: Christine throws a ball straight up, letting go of the ball at a height of yi above the ground. When she lets go, the ball has an initial speed vi. The ball travels straight up to its maximum height ymax and falls back down. Assume the frictional effects from air resistance are insignificant. New Question: If the initial upward speed of the ball in the phenomenon described above is 10 m/s, and the ball is released at a height of 1.5 m above the floor, what is the maximum height above the floor that the ball reaches? How far above Christine’s hand is the ball when it reaches its maximum height? How is this value relate to ∆y = yf - yi? Does the sign of ∆y make sense for this scenario? How do you know?