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## Homework Statement

A rock is thrown down off a cliff at 18 m/s at an angle of 17 below the horizontal. If the rock hits a cliff that is 16m away, how far down did the rock fall.

## Homework Equations

Vf= Vi + at

change in Y= Vit + .5at^2

## The Attempt at a Solution

I tried solving for time and then plugging that back into the equations and I kept getting -3.87. Please help!