A ball is dropped from rest from the top of a building of height 10m. At the same instant, a second ball is projectedvertically upward from ground level, such that it has zero speed when it reaches the top of the building. When the two balls passeach other, which ball has the greater speed, or do they have the same speed? Explain. Where will the two balls be when they are alongside each other: at height 5 above the ground, below this height, or above this height? explain.