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If an object is dropped from a height of 144 ft, the function h(t) = –16t² + 144 gives the height of the object after t seconds. When will the object hit the ground?

• 1.5 s
• 3 s
• 6 s
• 9 s

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2 answers
  1. it will hit the ground when the height h(t) = 0

    -16t^2 + 144 = 0
    16t^2 = 144
    t^2 = 144/16 = 9
    so t =√9 = 3

    after 3 seconds

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  2. That helps alot - Thanks.

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