Question 1198165
Re: Your Question,  flight of ball: H(t)=16t^2+80t 
At that flight it will never hit the ground
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how long does it take for the golf ball to hit the ground:
IF flight of ball: H(t)= -16t^2+80t
-16t^2 +80t = 0
 16t^2 = 80t
   t = 80/16 = 5sec