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å·²ç¥g=9.8(m/s)ï¼v=7.9(km/s)ï¼è®¾éæåå¾ï¼R'=0.95Rï¼éæè´¨éï¼M'=0.82M
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GM'm/(R'^2)=mg'
å¾g'=(0.82GM)/(0.9025R^2)=0.9086gï¼8.9(m/s^2)
çï¼éåå é度为8.9m/s^2ã
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GM'm/R'^2=mv'^2/R
å¾v'=0.9291vï¼7.3(km/s)
çï¼ç¬¬ä¸å®å®é度æ¯7.3km/sã
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