SOLUTION: 1. A ball is hit upward. Its height h in feet after t seconds is given by
h=-16t^2 + 80t + 4. At what times is the ball 100 feet in the air?
searcheagle@yahoo.com
Algebra.Com
Question 441499: 1. A ball is hit upward. Its height h in feet after t seconds is given by
h=-16t^2 + 80t + 4. At what times is the ball 100 feet in the air?
searcheagle@yahoo.com
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
You have a projectile launched vertically at 80 feet per second initial velocity from a position 4 feet above ground level (height zero).
\ =\ -16t^2\ +\ 80t\ +\ 4)
gives the height at 
seconds if the instant of launch is 
You want to know the value of when \ =\ 100)
So:
Just solve the quadratic for the two values of . Hint: Divide through by -16 and then factor the resulting trinomial.
John
My calculator said it, I believe it, that settles it
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