2. A single force acts on a 2.0 kg particle-like object in such a way that the position of the object as a function of time is given by  x = 3.0t - 4.0t2 + 1.0t3, with x in meter and t in seconds. The work done on the object by the force from t = 0 to t = 4.0 s is _(2)_ J.