(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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?

2. Relevant equations

R = V^{2}/g*sin(2theta)

v^{2}= (v_{0}*sin(theta))^{2}- 2gy

3. 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..

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# Homework Help: Stone thrown off a cliff

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