[題目] 功與能

[yuhsuan0103 (Ichiro)]

[領域]力學                             (題目相關領域)

[來源] 習題                            (課本習題、考古題、參考書...)

[題目]For a rocket moving vertically in the presence of gravity, what is its speed
in terms of
its mass m at time t? Here, we assume that its mass is initially m0 and the
exhaust
speed of the gas relative to the rocket is constant u

[瓶頸]考慮重力就解不下去了                             (寫寫自己的想法，方便大家為你解答)


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