1. The problem statement, all variables and given/known data When you drop a rock into a well you hear the splash 2.8 seconds later. How deep is the well? 2. Relevant equations t = t1 + t2 d = .5 * g * (t1)^2 d = v * t2 3. The attempt at a solution since the time is so small i used the the second equation d = .5 * (9.81) (2.8)^2 = 38.45 m but when i put it into my webassign online hmwk page it said it was wrong but within 10% of the correct answer. does anyone have any advice. I wasnt sure how to take into account the speed of sound.