Answers

  • Brainly User
2016-07-14T08:14:53+08:00
T = -16t² + 64t

Solve for t:
-16t² + 64t = 0   ⇒  (at 0 ft. height, which is the ground)

-16t (t - 4) = 0

t - 4 = 0

t = 4

ANSWER:  At 0 ft. height (ground), the projectile hits the ground after 4 seconds.
1 4 1