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27 April, 12:54

The velocity of a car teduces from 30 km/h as the car approaches a stop sigh. Is this an example of positive or negative accelerationthe

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  1. 27 April, 14:09
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    The stopping car has negative acceleration.

    Explanation:

    We know acceleration is the rate of change of velocity. That is

    Acceleration (a) = (Final velocity - Initial velocity) / Time taken.

    Here Final velocity = 0 km/h (car stops) and initial velocity = 30 km/h

    So acceleration = (0-30) / time = - 30 / time

    Time is always positive, so - 30/time is negative, so the stopping car has negative acceleration.
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