本题目来源于试卷: Physics Unit7: Linear Momentum，类别为 通用国际物理
[单选题]
A freight car moves along a frictionless levxif8dn; s vrn9odu 6()el railroad track at constant spetb bkrd+q36mx78qcx0 wefw8vw .6w: ned. The car is open on top. A large load of coal is suddenly dumped into the car. What happe xw3e dbq7rw6tf:q+6 bv .k0w8mwnx8cns 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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