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
정지에너지는 물체가 움직이지 않을 때의 에너지입니다.jeongji eoneojineun mulchega umjigiji anheul ttaeui eoneojiibnida.Rest energy is the energy of an object when it is not moving.