一个质点在恒力http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/f21e611d191940a3b5e696670bd7b7f0.png作用下，其位移为http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/071baab0418846f79ccc130c1dec07ca.png则这个力在该位移过程中所作的功为
举一反三
- 一个质点在恒力 作用下，其位移为 则这个力在该位移过程中所作的功为http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/f21e611d191940a3b5e696670bd7b7f0.png
- 设http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/5f9f81d9a1184c2eb383cb81ebbe2768.png，若http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/410a0d9f8b4a4f82a6818a45f4a3b450.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/637f75734cb849caa773da5377f55f5e.png，http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/29aefd40f6c54e788587a2115dd02467.png，则http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/631634fcf7854ec88eedede14de7c1de.png之间的大小顺序为（ ）<br>
- 一个质点同时在几个力作用下的位移为其中一个力为恒力则此力在该位移过程中所作的功为（ ）。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201707/e3dfd69b50db4b4bad94f7cc2f4fe171.png
- http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/44f4d22711964c23980340adb7809625.pnghttp://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/3d4966e983de4b688abd5941e42a0548.png
- 根据瞬时速度矢量的定义，在直角坐标系下，其大小可表示为 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/216af49737494503bcc60d629711590e.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/61bf4252ab7143dd963055ac61528d9d.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/be254f5fb29d44669cf22d6edc9399c0.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201908/2692ac1ea4ef4ce3a928606065a9086c.png" />