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

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

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