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A ball dropped from the 9th story of a m...

A ball dropped from the 9th story of a multi - storeyed building reaches the ground in 3 second. In the first second of its free fall, it passes through storeys, where n is equal to ( Take `g=10 m s^(-2)`)

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`9y=1/2xx10xx3xx3` or y=5m
Again, `nxx5=1/2xx10xx1xx1`=5 or n=1
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