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12 August, 16:08

An object is thrown upward from the top of an 80ft tower.

The height h of the object after t seconds is represented by the quadratic equation h = - 16t^2 + 64t + 80.

After how many seconds will the object hit the ground?

A. 29 seconds

B. 6.4 seconds

C. 5.0 seconds

D. 8.0 seconds

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Answers (1)
  1. 12 August, 19:17
    0
    C because if you solve for the solutions for the quadratic, then you get 5 and - 1 but you cant have negative seconds so 5 is the right answer!
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