1. The problem statement, all variables and given/known data Two students conduct physics experiments on a balcony 19.6 m above the street. One student throws a ball vertically downward at 14.7 m/s. At the same instant the second student throws a ball vertically upward at the sam speed. The second ball follows the same path as the first ball on its way down. ΔX=19.6 Vi=14.7 a=-9.8 2. Relevant equations A.) What are the velocities of each ball at the instant before they strike the ground? B.) What is the difference in the time the balls spend in the air? C.) How far apart are the balls 0.800s after they are thrown? 3. The attempt at a solution A.) Vf^2=14.7^2+2(-9.8)(19.6) Vf^2=-168.07 The square root of a negative number is not a real number obviously so not sure what to do here.