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physics urgent please help!

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way safety engineers build soft barriers
so that cars hitting them will slow down at a
safe rate. A person wearing a safety belt can
withstand an acceleration of 300 m/s
How thick should barriers be to safely stop
a car that hits the barriers at 81.7 km/h?
Answer in units of m

  • physics urgent please help! -

    v=81.7 km/h =81700/3600=22.7 m/s
    d= v²/2a=22.7²/300=1.72 m

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