How high is the fence

Q. A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5s after reaching this maximum height, the ball is observed to barley clear a fence that is 97.5 m from where it was hit. How high is the fence?

Q. A paperweight, when weighed in air, has a weight of W = 7.4N. When completely immersed in water, though, it has a weight of Win water = 4.40 N. Find the volume of the paperweight.