1. The problem statement, all variables and given/known data A boulder starts from rest and travels 2.70 m in the first second (from t = 0 s to t = 1 s). How far will it travel in the second second (from t = 1 s to t = 2 s)? Assume the acceleration of the boulder is constant. 2. Relevant equations a=(V-Vo)/t X=Xo+at v^2-Vo^2=2a(X-Xo) 3. The attempt at a solution My problem is figuring which equation to use because I keep getting different accelerations depending on which one I use. The first equation gives me a=(2.70m/s)/1s =2.70m/s^2. Second equation gives me a= 2.70m/s, looking back now I guess this answer cannot be it because it is not in m/s^2. Last equation gives me (2.70m/s)^2 /(2.70m *2)= 1.35m/s^2. How can I determine which equation should be used for this problem and for future problems. I have noticed that I can normally determine the other variables well, but I keep getting the acceleration wrong. Thank you!