Position x vs Time t

xo(m)   vo (m/s)   ao(m/s2)   da/dt(m/s3)
The curve here is nonlinear. This means that the acceleration is nonzero. The fact that the curve is curving upwards tells us that the puck is speeding up, or in other words, that the acceleration is in the same direction as the velocity. In this case, both are in the positive direction. Note that you can get the velocity at any point by getting the slope of the tangent at that point.