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7. A rocket set for vertical launching, has a mass of50 kg and contains 450 kg of fuel. It can havemaximum exhaust speed of 2 km/s. If g 10 m/s?the minimum rate of fuel consumption just to lift itoff the launching pad will be(1) 2.5 kg/s(3) 5 kg/s(2) 10 kg/s(4) 20 kg/s

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