From the window of a building, a ball is tossed from a height y₀ above the ground with an initial velocity of 8.40 m/s and angle of 21.0° below the horizontal. It strikes the ground 6.00 s later.
(a) If the base of the building is taken to be the origin of the coordinates, with upward the positive y-direction, what are the initial coordinates of the ball? (Use the following as necessary: y₀.)
