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10. Some racetracks use compression barriers which behave like springs to absorb some of the energy of the impact when a car hits the guardrail.

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10. Some racetracks use "compression barriers" which behave like springs to absorb some of the energy of the impact when a car hits the guardrail. If a 1500 kg racecar hits the guardrail at a speed of 70.0 m/s and the compression barrier has a spring constant of 73.5 kN/m, what length would the barrier have to be to stop the car? (2)

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