If you triple the speed of your car, you increase its force of impact by:

• 3 times
• 4 times
• 6 times
• 9 times
  Explanation:

  "If you triple the speed of your car, you increase its force of impact by a factor of nine. This is because the force of impact increases with the square of the speed. So, tripling the speed results in (3^2 = 9) times the force of impact."