‍一物体按规律<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/e4c2f9b8bf6b4905a56e2158e19f7922.png?x-oss-process=image/sharpen,200"/>做直线运动，速度<img src="http://jgxm-question.oss-cn-beijing.aliyuncs.com/psst/files/7cd2e6bcbaa0473e90bbd0f26b86ac7e.png?x-oss-process=image/sharpen,200"/>( )