Just to be clear, the jumper velocity (and thus kinetic energy) of the jumper at the top and the bottom are both zero.
我来解释一下，整个跳楼过程中，跳楼者的速度（由此便产生了动能）在起跳处和着地处都为零。
2
The result showed that systolic peak velocity of bottom cerebral arteries in heroin addicts was much higher than that of the normal control group (P<0.01).
结果表明观察组脑底动脉收缩期峰值血流速度明显高于正常对照组，差异非常显著（P＜0．01）；
3
The more the bubble close to the free surface, the narrower the bottom jet develops crosswise, and the larger the pressure gradient, the rising velocity and the height of the bottom jet is upwards.