Two students are on a balcony a distance h above the street. One student throws a ball vertically downward at a speed vi; at the same time, the other student throws a ball vertically upward at the same speed. Answer the following symbolically in terms of vi, g, h, and t.
(a) Write the kinematic equation for the y-coordinate of each ball.
(b) Set the equations found in part (a) equal to height 0 and solve for y 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 t after they are released and before they strike the ground

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