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6 September, 15:52

A car traveling at a speed of 30.0 m/s encounters an emergency and comes to a complete stop. How much time will it take for the car to stop if it decelerates at - 4.0 m/s^2?

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  1. 6 September, 15:56
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    So for this one you have vf=0 because in the end the velocity would be 0, vo or velocity initial would be 30m/s because that's the initial speed we are looking at and you have - 4.0 m/s^2 as your acceleration. You would use the formula vf=vo+at and plug those in to find your t.

    So, it would be

    0=30-4 (t)

    -30=-4 (t)

    -30/-4=t

    t=7.5 seconds

    The answer would be 7.5 seconds.
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