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一、选择题(本题包括7小题.每小题给出的四个选项中,有的只有一个选项正确,有的有多个选项正确) 1.如图1所示,质量为m的小球用水平弹簧系住,并用倾角为30°的光滑木板AB托住,小球恰好处于静止状态.当木板AB突然向下撤离的瞬间,小球的加速度
First, the multiple-choice questions (This question includes 7 quiz. Each quiz given four options, some only one option is correct, and some have multiple options correct) 1. As shown in Figure 1, the mass of m small The ball is tied with a horizontal spring and held with a smooth wooden board AB at an angle of 30 °, the ball is at rest. When the board AB suddenly evacuates downward, the ball's acceleration