In this case, the acceleration of the bird is different after the tap.
这一情况下，点击前后的加速度是不同的。
2
After five deaths and 271 injuries from car accidents linked to supposed incidents of unintended acceleration of the Audi 5000, Audi of America recalled 250,000 of its vehicles in 1987.
奥迪5000车型意外加速导致5人死亡、271人受伤后，奥迪美国分部于1987年召回25万台汽车。
3
I put a mass, m1, here, and I measure the acceleration that this pull causes on this mass immediately after I release it.