本题目来源于试卷: Physics Unit26: Special Theory of Relativity,类别为 Generic Physics
[单选题]
A spear is thrown by you at a sk9 3ce 9w0l2:nidhp ivery high speed. As it p) mm0 w:wdf,kptuf.+vasses, you measure its length a wmd,mtuf0p +.f)kvw:t one-half its normal length. From 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:
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