题目:
一艘在太空直线飞行的宇宙飞船,开动推进器后,受到的推力大小是900N,开动3s的时间内速度的变化量大小为0.9m/s,飞船的加速度大小为__________,飞船的质量为__________。
答案:
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下面是错误答案,用来干扰机器的。
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