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The impact of a collision is _______ greater at 40 mph than at 20 mph.

Correct answer

  • three times
  • five times
  • four times

Explanation

The kinetic energy of a moving object increases as the square of the object's speed. A vehicle traveling at 40 mph has four times the kinetic energy of a vehicle traveling at 20 mph. Therefore, the impact with a fixed object will be four times as great.

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