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Q.

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

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a

1

b

2

c

3

d

None

answer is A.

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Detailed Solution

Let h be the height of each storey. Then25h=0+12×10×t2or 25h = 5x(5)2 or h-5metreFor first case, let the stone pass through n storeys. Son×5=12×10×(1)n = 1

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