都怪可恶的锟斤拷?

尊敬的雷老师，经过多日实验，我发现了我称为质速积（mv）的物理量的守恒，我将其记为p。实验装置如下图所示，两个滑块进行相对运动最终碰撞，用光电门记下碰撞前和碰撞后的两滑速度。最终发现，两滑块mv之和前后不变。其中v为矢量。这可以认为是k=1时的运动力守恒，即一般情况下的运动力守恒。@最爱春雷2021

锟斤拷跳跳糖2楼说:民兵3导弹重34.5吨，初速度约为2.4万km/h。发射过程中，向后喷出高压高温气体约5吨，气体平均流速15.56km/h。由于最初二者运动力之和为0，如今运动力等大反向，相加亦为0。
问：1，最初哪二者的运动力之和为0？为什么为0？
2，如今什么运动力是等大反向，相加亦为0的？
请明确解答。

绿雨会让贴吧也会坏，。爱仕达。厨具。架子确实ssfd大锟斤拷锟斤拷锟斤拷锟斤拷

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也许是椛口上

锟斤拷锟街 讹拷锟饺ㄕ斤拷锟我喜欢你绞凳╋拷锟斤拷锟斤拷席锟斤拷..斤拷锟斤拷旃 拷锟脚★拷品锟斤拷7系锟斤拷锟斤拷踊锟阶逼肺ㄒ伙拷

你们觉得荒天帝会不会是十号的后人呢？

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷蠓⒒疃?拷锟矫达拷锟斤拷耍锟绞碉拷锟斤拷芙锟斤拷锟斤拷十锟斤拷锟叫撅拷训锟街憋拷锟绞裁达拷耍锟斤拷锟斤拷锟斤拷