Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
충격력영향은 물체의 운동에 큰 영향을 미친다.chung-gyeoknyeok yeonghyang-eun mulche-ui undong-e keun yeonghyang-eul michinda.The impact has a significant effect on the motion of the object.