A child applies a force F parallel to the x-axis to a l0.0-kg sled moving on the frozen surface of a small pond. As the child controls the speed of the sled, the x-component of the force she applies varies with the x-coordinate of the sled as shown in Fig. 6.31. Calculate the work done by the force F when the sled moves
(a) From x = 0 to x = 8.0m;
(b) From x = 8.0m to x = 12.0m; (c) from x = O to 12.0m.

(N) 10 0 4 8 12