a glass-enclosed elevator at a sports arena moves upward from the ground floor at a constant speed of h = 9t.
at the same time the elevator starts to rise, a cannon on the arena floor shoots a souvenir mini-basketball into
the air at an initial velocity of 60 feet per second. the height of the mini-basketball (neglecting air resistance)
can be modeled by the equation h=-16t' + 60t. in both equations, h is height in feet and t is time in seconds.
find the time for the ball and the elevator to be at the same height again. if necessary, round your answer to
the nearest tenth of a second.
a. 1.7 seconds
c. 2.4 seconds
b. 3.2 seconds
d. 1.5 seconds