A stone is dropped from 25th storey of a multistorey building and reaches the ground in 5s. How many storey of the building will the stone cover in first second, if the height of each storey is same?
(Take g=10m/s2)
A
1
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B
2
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C
3
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D
5
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Solution
The correct option is A1 Let height of single storey is h, then total height from where stone was dropped, H=25h
Given, u=0,a=g,s=H,t=5
Therefore, using s=ut+12at2 ⇒H=0×t+12gt2 ⇒25h=12×10×52 ⇒h=5m
So, height of one storey is 5m
Now, distance travelled in 1s=ut+12at2 =0+12g×12 =5m
Therefore stone will pass through one storey in first second.
(A) option is correct