So we want to figure out what does it obtain its maximum acceleration? So let's just review what they gave us. They gave us velocity as a function of time. So let's just remind ourselves. If we have, let's say our position is a function of time, so let's say x of t is position as a function of time, then if we were to take the derivative of that, so x prime of t, well, that's going to be the rate of change of position with respect to time or the velocity as a function of time. And if we were to take the derivative of our velocity, then that's going to be the rate of change of velocity with respect to time. Well, that's going to be acceleration as a function of time.