SOLUTION: Solve: If an object is thrown upward with an initial velocity of 64 ft/sec, its height after t sec is given by h = 64t - 16t2. Find the number of seconds the object is in the ai

Question 144914: Solve:
If an object is thrown upward with an initial velocity of 64 ft/sec, its height after t sec is given by h = 64t - 16t2. Find the number of seconds the object is in the air before it hits the ground.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!

If you substitute , you see that
That is the time and the height when the object is
released.
What you want to find is another time when ,
and that will be the time when the object has come
back to earth, so

This equation is true if either of the factors, , or
is zero

So the object is in the air 4 sec before it hits the ground
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