golf ball is hit at ground level The ball is observed to rea

golf ball is hit at ground level. The ball is
observed to reach its maximum height above
ground level 6.9 s after being hit. 1.1 s after
reaching this maximum height, the ball is
observed to barely clear a fence that is 357 ft
from where it was hit.
The acceleration of gravity is 32 ft/s2 .
How high is the fence? Answer in units of
ft.

Solution

h(t) = -16t^2 + vt (v = initial vertical speed)
v = 32*6.9 = 220.8 ft/sec
h(t) = -16t^2 + 220.8t
t = 6.9 + 1.1 seconds
h(8) = -16*64 + 220.8*8 = -1024 + 1766.4
h = 742.4 feet
That\'s a tall fence, I suspect a number isn\'t right. 13.8 seconds is a LONG flight time for a golf ball.