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A dust packet is dropped from 5th storey of a multi-storeyed building

A dust packet is dropped from 5th storey of a multi-storeyed building.In the first second of its free fall another dust packet is dropped from 7th storey 15m below the 9th storey.If both packets reach the ground at same time,then height of the building is

Options

(a) 25m
(b) 15m
(c) 20m
(d) 16m

Correct Answer:

20m

Explanation:

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