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17 January, 09:18

A boat is moving at the rate of 15.0 meters per second. It's speed is then decreased uniformly to 3.0 meters per second. It takes 4 seconds for the speed to decrease. What is the magnitude of the deceleration of the car?

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  1. 17 January, 10:14
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    -3 m/s²

    Explanation:

    The formula for deceleration is given as the change in speed over a period of time

    Given that,

    Initial speed = 15 m/s

    Final speed = 3 m/s

    change in speed = 3-15 = - 12 m/s

    Time taken = 4 sec

    Deceleration = - 12/4 = - 3 m/s²
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