Mechanical energy is conserved, because gravity is a conservative force.
机械能是守恒的,因为重力是守恒力。
Momentum is conserved, because there was no net external force, so now kinetic energy is also conserved.
动量是守恒的,因为它不受外力,因此动能也是守恒的。
A fundamental law of physics holds that momentum is always conserved, meaning that unless some outside force enters a system, its total momentum must stay constant.
物理学一条基本定律认为动量守恒,也就是说,除非外力进入系统,否则总动量一定保持不变。
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