Just finished an exam. One problem is bothering me and I want to be certain if it's right. 1. The problem statement, all variables and given/known data What is the maximum velocity of an object dropped from a 20 m cliff? Assume no air friction and gravity is 10 m/s/s. 2. Relevant equations None given, but I assume v=gt is relevant. 3. The attempt at a solution 15 m/s. My reasoning was that if after 1s, the object fell 10m at 10m/s, and after 2s, the object has fallen 30m (10m + 20m) at 20m/s (10m/s + 10m/s), then I can divide the 2nd speed increment in half to determine speed at 20m fall (10m/s + 5m/s). I tried using equations before answering 15. v=gt by itself can't work without t (t was not given). d=1/2gt^2 tells me the object fell for 2s, but that doesn't seem right (it would have traveled 30m). Assuming t=2s is right, v = 10m/s/s * 2s = 20m/s. So which is right: 15 or 20?