SOLUTION: an object is thrown upward from the Trump Tower in New York City,which is 664 feet tall, with an initail velocity of 45 feet per second. How long will it take the oblect to reach t
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Question 380857: an object is thrown upward from the Trump Tower in New York City,which is 664 feet tall, with an initail velocity of 45 feet per second. How long will it take the oblect to reach the ground?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The function for the height of a projectile as a function of time, 
, given an initial velocity of 
and an initial height of 
is:
\ =\ -16t^2\ +\ v_ot\ +\ h_o)
Substitute the known values to get the specific function for this problem:
\ =\ -16t^2\ +\ 45t\ +\ 664)
.
The height of the ground is zero, so if we want to know when the projectile hits the ground, \ =\ 0)
.
Therefore solve:
for and discard the negative root.
John
My calculator said it, I believe it, that settles it
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