本题目来源于试卷: Physics Unit7: Linear Momentum，类别为 国际高中通用物理
[单选题]
A freight car moves along a fri3yy 56y :24jr g/wbfpuyzkg f1cebx2lv wf+e ah nqjrs* ))09p,tionless level railroad track at constant speed. The car is open on top. A large load ofws 0al9)brv2q*)jx e+pe n, hf coal is suddenly dumped into the car. What happens to the velocity of the car?
A. It increases.
B. It remains the same.
C. It decreases.
D. cannot be determined from the information given
参考答案: C
本题详细解析:
暂无
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