(iii) (4 pts) A plane moving at constant horizontal velocity, vo = 80 m/s at some altitude, h , drops a package time t = 0. The package follows the parabolic path shown in the figure and lands on the ground at a distance A x = 640 m from the launch point. a) How long does it take for the package to reach the ground? Ax c) What is the altitude & of the plane