SOLUTION: A football is kicked straight up from a height of 4 feet with an initial speed of 50 feet per second. The formula H= -16t squared +50t+4 describes the ball's height above the groun

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Question 628334: A football is kicked straight up from a height of 4 feet with an initial speed of 50 feet per second. The formula H= -16t squared +50t+4 describes the ball's height above the ground, h, in feet, t seconds after it was kicked. How long will it take for the football to hit the ground?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
A football is kicked straight up from a height of 4 feet with an initial
speed of 50 feet per second
The formula H= -16t squared +50t+4 describes the ball's height above the
ground, h, in feet, t seconds after it was kicked.
How long will it take for the football to hit the ground?\
:
When the ball hits the ground h = 0, therefore
:
-16t^2 + 50t + 4 = 0
Solve this using the quadratic formula
t+=+%28-50+%2B-+sqrt%2850%5E2-4%2A-16%2A4+%29%29%2F%282%2A-16%29+
you should get a positive solution of t ~ 3.2 seconds