A 2kg book is sitting on a horizontal glass table top. A woman pushes the book across the table with a horizontal force F. The book's position changes as a function of time given by x(t) = (2.9 m/s^3)t^3-(3.6 m/s^2)t^2. What is the book's velocity at .2 second? Calculate the magnitude of the force at .2 seconds. Find the work done by the force during the first 1.2 seconds of its motion.