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in an air bag test a car traveling at 100km/h is remotely driven into a brick wall. suppose an identical car is dropped onto a hard surface. from what height would the car have to be dropped to have the same impact that with the brick wall?

  • physics -

    100 km/h = 100000/3600 = 27.78 m/s
    Equate kinetic energy to potential energy at equivalent height, h
    mgh = (1/2)mv²
    =39.4 m

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