Question

If a ball is thrown upwards at 20 ft/sec, the height h after t seconds is given by h = -16t2+ 20t.

How many seconds does it take for the ball to reach its maximum height, and what is this height?

Answer 1

A. time = 5/16 seconds
height = 5 and 1/8 feet

B. time = - 5/8 seconds
height = 6 and 1/4 feet

C. time = 5/8 seconds
height = 6 and 1/4 feet

D. time = - 5/16 seconds
height = 5 and 1/8 feet