本题目来源于试卷: Physics Unit26: Special Theory of Relativity，类别为 国际高中通用物理
[单选题]
A spear is thrown by hecya88ig f;1+qekt 4 no n5ti4 z5df2you at a very high speed. As it passes, you measure its length at one-half its normal length. From this measurement, you conclude thation45zn 2d 5ft the moving spear's mass must be
A. one-half its rest mass.
B. twice its rest mass.
C. four times its rest mass.
D. none of the given answers
参考答案: B
本题详细解析:
暂无
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