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You are trying to roll a toy car up a hill and stop at the top without rolling down the other side of the hill. If the car has a mass of 0.5 kg and the hill is 0.07 meters high, how much kinetic energy should you use on the car to move it to the exact top?

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According to law of conservation of linear momentum

  • PE=KE
  • KE=mgh
  • KE=0.5(9.8)(0.07)
  • KE=4.9(0.07)
  • KE=0.343J
  • KE=343mJ

Answer:

0.35 J

Explanation:

This problem requires the Law of Conservation of Energy.

β‡’ Potential energy = Kinetic Energy

β‡’ mgh = 1/2mvΒ²

β‡’ 0.5 x 10 x 0.07 = KE

β‡’ KE = 5 x 0.07

β‡’ KE = 0.35 J