Question

Two students are on a balcony 24.3 m above the street. One student throws a ball, b1, vertically downward at 15.8 m/s. At the same instant, the other student throws a ball, b2, vertically upward at the same speed. The second ball just misses the balcony on the way down.
(a) What is the difference in time the balls spend in the air?
s

(b) What is the velocity of each ball as it strikes the ground?
velocity for b1 m/s
velocity for b2 m/s

(c) How far apart are the balls 0.510 s after they are thrown?
m