Terry O.

# How many seconds will it take for the ball to reach a height of 80 feet?

If a ball is thrown upward from the ground with an initial speed of 96 feet per second, its height h, in feet, after t seconds is
h = −16t2 + 96t.
How many seconds will it take for the ball to reach a height of 80 feet? There are two answers. (Enter your answers as a comma-separated list.)
t =
sec

Explain why there are two answers.

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Terry O.

I do not understand the answer.
How many seconds will it take for the ball to reach a height of 80 feet?
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02/22/18

Terry O.

I do not understand how many seconds or how you are getting to an answer.

Terry
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02/22/18 Philip P.

Solve the quadratic equation t2 - 6t + 5 = 0 to get the answers.  You solve a quadratic by factoring or by using the quadratic formula (hint: this one factors).  Quadratic equations usually have two answers.  Can you solve the quadratic?
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02/22/18

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