Test Academy | If the frequency of the rotating platform is f and the distance of a boy from the centre is r, which is the area swept out per second by line connecting the boy to the centre πrf, 2πrf, πr²f, 2πr²f

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If the frequency of the rotating platform is f and the distance of a boy from the centre is r, which is the area swept out per second by line connecting the boy to the centre

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πrf
2πrf
πr²f
2πr²f

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