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))

A ball dropped from the 9th story of a multi - storeyed building reach

1.	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))
Answer» SOLUTION :`9Y=(1)/(2)xx10xx3xx3ory=5m` Again, `nxx5=(1)/(2)xx10xx1xx1=5 or n=1`