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A ball dropped from 9th stair of multist...

A ball dropped from 9th stair of multistoried building reaches the ground in 3 sec. in the first second of its free fall, it passes through n stare then n equal to

A

1

B

2

C

3

D

4

Text Solution

Verified by Experts

The correct Answer is:
A
`nh=(1)/(2)g t^(2)`, h `=` height of each story (constant)
`npropt^(2)`
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