SOLUTION: your keys fall from a height of 196ft how long will it take for your keys to hit the ground?
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Question 431102: your keys fall from a height of 196ft how long will it take for your keys to hit the ground?
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
The height of a projectile in feet at time 
given an initial velocity of 
and an initial height of 
is given by:
\ =\ -16t^2\ +\ v_ot\ +\ h_0)
You have a zero initial velocity and a 196 ft initial height, so:
\ =\ -16t^2\ +\ 196)
The ground is height zero, so solve:
Since this is a quadratic, you should get two roots. One of them will be negative. Since you don't care what happened BEFORE you dropped your keys, discard the negative root.
John
My calculator said it, I believe it, that settles it
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