论文部分内容阅读
当小球以一定初速v_0从光源S所在位置处水平抛出后,在抛出点正前方的竖直墙壁上就出现了小球的影子,一道选择题在答案中指出:球影做匀速直线运动。对此结果,曾有学生十分不解地提出质疑:小球在
When the ball is thrown horizontally from the position of the light source S at a certain initial velocity v_0, the shadow of the ball appears on the vertical wall in front of the throw point. A multiple-choice question indicates in the answer: movement. As a result of this, some students questioned very puzzlingly: