Question

The mass *m* (in Mg) of the fuel supply in the
first-stage booster of a rocket is *m* = 136 ? 6*t*
?*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.)

Answer #1

when m=6 mg

negative value is not possible

so answer is second

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