1. The problem statement, all variables and given/known data A train travels along a straight track. Its position is given by x(t) = At^3 + Bt from t = 0 to t=5.0 s. a- find an expression for the velocity. b- find an expression for the acceleration. c- if the train has an acceleration of 2.00 m/s^2 and a velocity of 10.0 m/s at t=5, find 'A' and 'B'. 2. Relevant equations v= dx/dt a = dv/dt 3. The attempt at a solution I got 3At^2 + B for velocity and 6At for acceleration. I got (1/15) for 'A' and 5 for 'B'. I don't have a book yet and just wanted to make sure i understand what I'm doing. Any help would be appreciated!