如图所示，一车厢长度为L、质量为M，静止于光滑的水平面上，车厢内有—质量为m的物体以初速度v0向右运动，与车厢来回碰撞n次后相对于车厢静止，这时车厢的速度为

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如图所示，一车厢长度为L、质量为M，静止于光滑的水平面上，车厢内有—质量为m的物体以初速度v₀向右运动，与车厢来回碰撞n次后相对于车厢静止，这时车厢的速度为（　）

A：，水平向右

B：零

C：

D：

上一题下一题 0.0难度选择题更新时间:2018-01-08 07:58:31

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C

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阅读短文，从每小题所给的四个选项中，选出能回答所提问题或完成所给句子的最佳答案。

A

Hope People's Hospital was built in 1888. It is the oldest hospital in Shanghai with an area of 290,000 ㎡ and there are 410 doctors and nurses. Every year, more than 2,350,000 patients come to the hospital to see the doctors and near 6800 patients stay in hospital for their treatments.

Address	South Road, Wanjiang Town, Shanghai
Working time	Working hours: 8:00a.m.—5:30p.m. from Monday to Sunday From 5:30p.m. to 8:00a.m. you may go to the Duty Station. We have doctors on duty at any time.
Divisions (科室)	Traditional Chinese Medicine Division	If you want to take some Chinese medicine, Doctor Li will help you.
	Mouth Room	If you have a toothache, you can ask Doctor Ma for help.
	Registration Fees	You can pay for medicine here.
	Surgery(外科)	If you cut your finger or hurt your knee, call Doctor Hu for help.
	ENT Department (ear-nose-throat department)	If you have a sore throat, you can come here for help.
	Digestive Department	If you eat too much, you can ask Doctor Zhang for help.
Contact	Tel: 0769-28637333 Email: gddgph@yahoo.com Website: www. gdwst.gov.cn

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