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19. 用细绳系一小球使之在竖直平面内作圆周运动,当小球运动到最高点时( )。

单选题
2021-09-01 19:09
A、小球将受到重力、绳的拉力和向心力的作用
B、小球将受到重力、绳的拉力和离心力的作用
C、小球可能处于受力平衡状态
D、绳的拉力可能为零
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正确答案
D

试题解析

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