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9 March, 16:52

The speed of a car is decreased uniformly from 30. meters per second to 10. meters per second in 4.0 seconds. What was the car's acceleration?

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  1. 9 March, 17:15
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    Acceleration (magnitude anyway) = (change in speed) / (time for the change).

    Change in speed = (10 - 30) = - 20 m/s

    Time for the change = 4.0sec

    Magnitude of acceleration = - 20/4 = - 5 m/s²
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