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12 March, 03:01

A car initially at rest accelerates in a straight line at 18 m/2^2. what will be its speed after 12 seconds?

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  1. 12 March, 06:41
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    Acceleration by definition is the time rate change of velocity. (velocity and speed are the same in unidirectional motion)

    When you say that your acceleration is 18m/s^2 what you're saying is that there is a change of 18m/s in velocity, every second.

    Since your acceleration or 'change' is positive, you know that the velocity is increasing.

    The net change in velocity over 12 seconds is = 12 x 18 = 216 m/s

    Since the body mentioned in the question was initially at rest, this is also the final velocity of the body.
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