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How can I do this, can you explain me

How can I do this, can you explain me-example-1
User Gerke
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1 Answer

9 votes

Answer:

Explanation:

Start with h(t) = -16t^2 + initial height, which here is h(t) = -16t^2 + 1296. Set this = to zero, which corresponds to the object hitting the ground (h = 0):

0 = -16t^2 + 1296. Dividing all terms by -16, we get t^2 = 81, whose positive square root is 9. It takes 9 seconds for the object to hit the ground.

User Imkingdavid
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