1. The problem statement, all variables and given/known data If acceleration=dV/dt, V=def.integal from t1 to t2 of a*dt,=at+C. At t=0, C=V0. Why do we have a constant C, as a definite integral was calculated. Won't C2 and C1 cancel out? 2. Relevant equations Definite integral from x1 to x2 of dx is x2-x1 without any constant, right? 3. The attempt at a solution I am really confused.