the Kinetic energy, physics homework help

  1. A ball is thrown vertically upward with a velocity of 10 m/s. Calculate the maximum height reached by the ball before it returns to the ground. (g = 10 m/s2
  2. How much work is done in pulling a box, on the ground, for 20 meters with a force of 20 Newtons making an angle of 10° with the ground? 
  3. When a car’s speed changes from 30 m/s to 15 m/s, its kinetic energy?
  4. Calculate the work done in pulling a box of 50 Kg up a 20° frictionless incline plane of length 15 m at a constant speed. 

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