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Q. A severe thunderstorm dumped 2 in of rain in 30 min on a town of area 50 km2. What mass of water (in kg) fell on the town? One cubic meter of water has the mass of 103 kg.

Q. A Cessna aircraft has a lift-off speed of 120 km/h.

(a) What minimum constant acceleration does this need if the aircraft is to be airborne after a takeoff run of 250 m?

(b) How long does it take aircraft to become airborne?

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