An object is launched at a speed of 20.0 m/s from the top of a tall tower. The height y of the object as a function of the time f elapsed from launch is y(f) = -4.90f2 + 19.32/ + 60.0, where h is in meters and t is in seconds. Determine:
a) The height H of the tower;
b) The launch angle;
c) The horizontal distance traveled by the object before it hits the ground.