1. The problem statement, all variables and given/known data A rock is dropped from a sea cliff and the sound of it striking the ocean is heard 4.7 s later. If the speed of sound is 340 m/s, how high is the cliff? 2. Relevant equations d=vit+.5at^2 vf^2=vi^2 +2ad vf=vi+at 3. The attempt at a solution so, i don't know how to have both the speed of sound and the rock's acceleration counted. i don't know, please help!