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physics

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A certain car is capable of accelerating at a rate of +0.90 m/s2. How long does it take for this car to go from a speed of 55 mi/h to a speed of 80 mi/h?

  • physics - ,

    It is mainly a matter of units conversion.
    Decide on what units you'd like to use for the final answer (usually seconds for cars). Convert everything to metres and seconds and use
    time = (final velocity - initial velocity) / acceleration

    To change from mph to m/s
    multiply by
    63360*0.0254/3600
    =0.44704
    I get 12.4 seconds

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