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Question

A stone is dropped from the 25th storey of a multi-storeyed building and reaches the ground in 5 s. In the first second, it passes through how many storeys of the building? (g=10 m/s2).

A
1
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B
2
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C
3
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D
None of these
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Solution

The correct option is A 1
Suppose h be the height of each storey
By using second equation of motion, we know that
s=ut+12at2
As the stone is at rest initially
u=0
Then, 25h=0+12×10×t2
=12×10×52
h=5 m
In first second, let the stone passes through n storeys.
So, n×5=12×10(1)2
n=1

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