然后他一跃自由而下，自由落体时的降落速度高达982公里/小时，几乎接近了1200公里/小时的声速，而且他还经历了零下52摄氏度的低温。
He then leaped and freefell at speeds of up to 614 mph, not far from the speed of sound's 761 mph, and endured temperatures as low as minus 94 degrees Fahrenheit.
经过一些时间的自由降落后，落体运动得很快，以至空气拽力(阻力)与落体的重量相等，于是就没有加速度了。
After some time of uninterrupted fall, the body is moving so rapidly that the drag of the air is as great as the weight of the body, so that there is no acceleration.
重量不同、大小不同的物体在真空状态自由降落时速度一样。
Objects falling freely in a vacuum have the same rate of speed regardless of differences in size and weight.
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