Question: To perform a rescue, a lunar landing craft needs to hover just above the surface of the moon, which has a gravitational acceleration of g/6.

To perform a rescue, a lunar landing craft needs to hover just above the surface of the moon, which has a gravitational acceleration of g/6. The exhaust velocity is 2000m/s, but fuel amounting to only 20 percent of the total mass may be used. How long can the landing craft hover?

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