A sled with mass 12.30 kg moves in a straight line on a frictionless horizontal surface. at one point in its path, its speed is 3.11 m/s ; after it has traveled a distance 2.81 m beyond this point, its speed is 6.11 m/s . Use the work-energy theorem to find the force ld acting on the sled, assuming that this force is constant and that it IC acts in the direction of the sled's motion.