1. The problem statement, all variables and given/known data A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 2.1s later. The speed of sound in air is 343 m/s. How high is the cliff? 2. Relevant equations [tex]Δx=½at^2[/tex] [tex]t_1+t_2=2.1s[/tex] [tex]t_2=x/343m/s[/tex] 3. The attempt at a solution I used those equations to mathematically solve for the value of x. However I was getting bizarre answers when I solved the system of equations. t1 or t2 should not be more than 2.1s, as that is the total time from when it was dropped and the sound travelled back up. I set down as negative, so I used -9.8 for a.