The speed of a motor increases from 1200rpm to 1800rpm in 20s. How many revolutions does it make in this period of time ?
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The answer depends on what the acceleration is. Or rather the acceleration at all times. If the rpm increases only in the last 10 seconds for example, it will take a lesser number of revolutions that if it accelerated constantly. But, if we assume that it does accelerate constantly, then the image should give you the answer.
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hope it helps you....dude
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