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有人在分析竖直上抛物体的运动时说,当物体上升到最高点时,即时速度为零,即相对于地面这个参照物的相对速度等于零,所以,物体处于静止状态,至少可以说,物体处于瞬间静止状态,这种说法对吗? 答:上述说法是欠妥的。判别物体是静止还是运动,总要选择一个假定不动的物体作为参照物的,通常选取地面为参照物。但是判别时,不是以它相对地面的即时速度是否为零而作结论的,而是以它相对于地面的
When someone analyzes the motion of a parabolic body, when the object rises to its highest point, the instantaneous velocity is zero, that is, the relative velocity of the reference object relative to the ground is equal to zero. Therefore, the object is in a state of rest, at least, the object In the moment of quiescence, is that correct? A: The above statement is not appropriate. To determine whether an object is stationary or moving, always select an object that is assumed to be unmovable as a reference object, usually selecting the ground as a reference object. But in judging, the conclusion is not based on whether its instantaneous speed relative to the ground is zero, but rather it is relative to the ground.