Question 983675
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That depends on whether it hits the ground at the top of the cliff where the waterfall starts or whether it hits the ground at the bottom of the falls.


In the first case, set *[tex \LARGE -16t^2\ +\ 24t\ =\ 0] and solve for the positive value of *[tex \Large t]


In the second case, set *[tex \LARGE -16t^2\ +\ 24t\ +\ 1300\ =\ 0] and solve for the positive value of *[tex \Large t].


If you want an even more precise answer determine the height of the guy's hand when the pebble was released and add that to the left hand side of whichever equation that appropriately models the situation.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \