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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 n storeys, where nis equal to (Take `g=10ms^(-2)`)

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`9y=(1)/(2)xx10xx3xx3ory=5m`
Again, `nxx5=(1)/(2)xx10xx1xx1=5 or n=1`
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