1. The problem statement, all variables and given/known data A stone is dropped of a cliff. A second stone is thrown down the cliff at 10 m/s at 0.5s after the first stone. When do the stones cross paths? 2. Relevant equations Yf = vt + at^2/2 3. The attempt at a solution My logic is the set the final position Yf equal for both stones and solve for time. Keeping in mind for the second stone that t = t + 0.5. After finding t, simply plug it into the equation to find Yf. Is this a valid method for solving this problem?