velocity at impact

例句：

1. 1. The car's velocity atimpact was measured to be 20mph.
   汽车在撞击时的速率被测量为每小时20英里。
2. 2. The projectaims to reduce the velocity at impact by30%.
   该项目旨在通过减少撞击速度来降低30%。
3. 3. Thephysicist calculated the velocity at impactbased on the data.
   物理学家根据数据计算了撞击速度。