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 you at a very h,lsyiu6*u 5j* iz2s./p oth+ )hymq esigh speed. Asl18fx r-pj x2u it passes, you measure its length at one-hal8-u xx12jflrpf 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:
暂无
| 
