And another piece flies off in this direction with mass m1, with velocity v1 prime.
另一片往这个方向飞，质量为m1，速度为v1。
Suppose this particle 1 has a mass five and the velocity is one.
假设这个粒子，质量为5，速度为。
How do we calculate the velocity of the center of mass?
我们怎样计算，重心速度呢？
Add an instant velocity change to the rigidbody, ignoring its mass.
添加一个瞬间速率变化给刚体，忽略它的质量。
So this is the velocity of the center of mass.
这就是重心速度。
One of those is kinetic energy, which is a function of mass and velocity.
其中之一是动能，这是一个功能的质量和速度。
Einstein's theory links energy with mass and velocity of light.
爱因斯坦的理论把能量同质量和光速联系起来。
Both velocity and mass are key ingredients to generating power.
速度和质量才是决定力量的关键要素。
Impact protection that meets all ANSI Z87.1 standards for high velocity and high mass impact resistance.
撞击防护符合所有ANSI Z 87.1关于高速撞击和重物撞击标准。
Impact protection that meets all ANSI Z87.1 standards for high velocity and high mass impact resistance.
撞击防护符合所有ANSI Z 87.1关于高速撞击和重物撞击标准。
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