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A stone dropped from a building takes 4 s to reach the ground. The height of the building is

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A stone dropped from a building takes 4 s to reach the ground. The height of the building is
A. `19.6m`
B. `80.4m`
C. `78.4m`
D. `156.8m`
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1 Answer

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Correct Answer - C
From `s=ut+(1)/(2)at .^(2)`
`h=0+(1)/(2)xx9.8(4)^(4)=78.4m`
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