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一火箭均匀地向后喷气,每秒钟喷出90g的气体,喷出的气体相对于火箭的速度为v0=300m/s ,设火箭开始时静止,火箭和燃料的总质量为 m0=270g。若火箭的燃料180g,则它能达到多大的速度?()(不计重力和空气阻力)

单选题
2021-09-06 21:06
A、600ln3m/s
B、300ln3m/s
C、200ln3m/s
D、400ln3m/s
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正确答案
B

试题解析

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一火箭均匀地向后喷气,每秒钟喷出90g的气体,喷出的气体相对于火箭的速度为v0=300m/s ,设火箭开始时静止,火箭和燃料的总质量为 m0=270g。若火箭的燃料180g,则它能达到多大的速度?()(不计重力和空气阻力)
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