Two students are on a balcony a distance hh above the street. One student throws a ball vertically downward at a speed v0v0; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of v0,g, hv0,g, h, and tt. (a) Write the kinematic equation for the yy -coordinate of each ball. (b) Set the equations found in part (a) equal to height 0 and solve each for tt symbolically using the quadratic formula. What is the difference in the two balls' time in the air? (c) Use the time-independent kinematics equation to find the velocity of each ball as it strikes the ground. (d) How far apart are the balls at a time tt after they are released and before they strike the ground?