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Question

A body is dropped from the roof of a multi-storeyed building. It passes the ceiling of the 15th storey at a speed of 20 m/s . If the height of each storey is 4 m, the number of storeys in the building is (take g=10 m/s2 and neglect air resistance)

A
20
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B
25
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C
30
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D
35
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