如图所示,用轻绳将重球悬挂在竖直光滑墙上,当悬绳变长时,下列

如图所示,用轻绳将重球悬挂在竖直光滑墙上,当悬绳变长时,下列说法正确的是

A.绳子拉力变大

B.绳子拉力变小

C.墙对球的弹力变大

D.墙对球的弹力变小

答案

BD


解析:

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