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## Homework Statement

A rock is thrown horizontally from the top of a 20-m high cliff and strikes the ground at an angle of 45 degrees. With what speed was it thrown?

## Homework Equations

R = V

^{2}/g*sin(2theta)

v

^{2}= (v

_{0}*sin(theta))

^{2}- 2gy

## The Attempt at a Solution

I have 2 unknowns no matter what equation I try to use. I've tried to get it down to one unknown, but I keep getting the wrong answer..