Q.

A stone is dropped from the 25th storey of a multistoried building and it reaches the ground in 5 s. In the first second, it passes through how many storeys of the building? g=10ms−2

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a

1

b

2

c

3

d

none of these

answer is A.

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Detailed Solution

Suppose h be the height of each storey. Then25h=0+12×10×t2=12×10×52 or h=5mIn first second, let the stone passes through n storey. Son×5=12×10×(1)2  or  n=1
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A stone is dropped from the 25th storey of a multistoried building and it reaches the ground in 5 s. In the first second, it passes through how many storeys of the building? g=10ms−2