The position of a particle as a function of time (in s) is given by C1 + C2t + C3t2. Let C1 = 12.1 m, C2 = 14.9 m/s and C3 = -0.38 m/s2. I was able to solve the first question, which was asking for the velocity at T=11.0 seconds. However, I don't understand how to solve this part of the question: What is the particle's acceleration at time t = 11.0 s? I thought acceleration was a constant? I tried punching the constant into Lon-capa, but it said the answer was wrong.