This concept includes: friction which primarily determines the reduction in the horizontal component of post-impact ball velocity;

擦力主要确认地面与网球表面接触时，地面对网球水平方向运行速度的影响性能；

youdao

Moreover, the use of additional resistance worn on the forearm while swinging a baseball bat did not contribute to further increases in instantaneous bat swing velocity and batted-ball velocity.

纵观这些有助于提高击球速度的因素，力量教练要用具备的科学研究信息去帮助棒球或垒球运动员增强其击球速度制定抗阻训练方案。

youdao

He used a body swerve to shake off a marker and create space for himself. Then, with marvelous disguise, with the merest of back lift from his left foot, he propelled the ball at startling velocity.

他突然变向摆脱掉防守他的球员，并为自己创造出空间，用一个逼真的假动作，仅仅向后提起左脚，就以惊人的速度将足球抽射出去。

youdao

Most computerized swing analyzers focus on ball velocity, spin and launch angle, but MAT-T measures every motion you make from address to impact, including total duration of the swing, which when measured over a series of swings, equates to rhythm.

FORBES: Take Strokes Off Your Golf Game Today - The Best Way To Buy New Clubs

The first step is simply for a player to note the time it takes for the ball to pass a fixed point to get a rough approximation of the velocity of the ball.

FORBES: Scientists Beat The House At Roulette With Chaos Theory

The ball disappeared with tremendous velocity over wide long-on, backward square-leg, extra-cover, backward point and mid-wicket while Broad and skipper Paul Collingwood played the role of startled rabbits.

BBC: England bow out with India defeat