The height of a projectile in feet at time given an initial velocity of and an initial height of is given by:
You have a zero initial velocity and a 196 ft initial height, so:
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
