200分求)大一物理题,因为是英语版的,呵呵
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fill in the blank: mvd.

两个质量为m速度为v的粒子沿着被某角度分开的平行线做相反方向的运动.角动量总值在任何原始出发点(都相等)

let the point be (x,y)

angular momentum of first particle = mvr1sin@ = mvp

angular momentum of second particle = mvr2sin@ = mvq

net angular momentum ( the angular momenta are in the same direction) = mvp+mvq =mvd (constant and independent of x and y)