Your professor enters the dogsled race during winter break. To getstarted, he pulls his sled, a mass 80 kg with a force of 180N at 20degrees to the horizontal. Find a) the work he does b) the final speed of the sled after it moves 30s. c) What F did your professor exert if the sled starts with a speed of 2m/s after he pulls it through the distance of 5m?