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Q. a ball dropped from the roof 9th storey of a multi stored building reaches the ground in 3 second. in the first second of its free fall ,it passes through in storey where n is equal to (take g=10m/s-²)
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Oxygen concentrators provide supplementary oxygen for patients with chronic obstructive pulmonary disease (COPD) and, in higher concentrations, for severe chronic hypoxemia and pulmonary edema. ... Oxygen concentrators consist of a cabinet that houses the compressor and filters; tubing; a nasal cannula and/or face mask.
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