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13 February, 09:57

A driver starts his parked car and within 5 seconds reaches a speed of 60km/h, as he travels east. What is his acceleration?

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  1. 13 February, 10:09
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    Acceleration =

    (change in speed) / (time for the change)

    and the direction of the change.

    Acceleration = (60 - 0) km per hour / 5 sec = 12 km per hour per second, east.

    I hear teachers all over the country complaining about that ugly unit.

    It has to be changed to a more familiar unit of acceleration.

    (12 km/hour) x (1 hour/3600sec) = 12,000/3600 = 3-1/3 meter/sec.

    His acceleration is 3-1/3 meters per second².
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