(2013江苏徐州摸底)如图所示,水平桌面上一小钢球沿直线运动.

2013江苏徐州摸底)如图所示,水平桌面上一小钢球沿直线运动.若在钢球运动的正前方A处或旁边B处放一块磁铁,下列关于小球运动的说法正确的是

A.磁铁放在A处时,小球做匀速直线运动

B.磁铁放在A处时,小球做匀加速直线运动

C.磁铁放在B处时,小球做匀速圆周运动

D.磁铁放在B处时.小球做变加速曲线运动

答案

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