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The mass m (in Mg) of the fuel supply in the first-stage booster of a rocket...

The mass m (in Mg) of the fuel supply in the first-stage booster of a rocket is m = 136 ? 6t ?t 2 , where t (in seconds) is the time after launch. When will there be only 6 Mg of fuel left in the booster? (Answer, in seconds, to three significant digits.)

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Answer #1

when m=6 mg

negative value is not possible

so answer is second

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