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A sled with mass 15 kg moves in a straight line on a horizontal surface as...

A sled with mass 15 kg moves in a straight line on a horizontal surface as it is being pulled by a force F at an angle of 30°with the direction of motion. A force of friction of 10 N acts on the sled. At one point in its path, its speed is 4.0 m/s; after it has traveled a distance 5.0 m beyond this point, its speed is 7.0 m/s.

  1. Use the work-energy theorem to find the total work done on the sled?
  2. Find the pulling force F on the sled.
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