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 ,w.s+dgr o;2ep9ajb eb p vpiu51. ;ityou at;tuu a*j xurif.400h s a very high speed. As it passes, you measure its length at one-half its normal length. ;.00tau f4i*ruhxs ujFrom this measurement, you conclude that 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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