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An observation deck extends 311 feet out above a valley. The deck sits 261 feet above the valley floor. If an object is dropped from the observation​ deck, its height h in​ feet, after t​ seconds, is given by h=-16t²+261. How long will it take for the object to be 5 feet above the valley​ floor?

Respuesta :

mhanifa

Answer:

  • 4 seconds

Step-by-step explanation:

Find the value of t in the following equation:

  • -16t² + 261 = 5
  • -16t² = - 255
  • t² = 255/16
  • t = √255/4 ≈ 4 seconds

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