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최고점 찍는 순간이 속도는 0일테고 등가속도 운동이니
-초기속도인 지점에 딱 공이 지붕에 걸침 이 말이 뭐냐 ?
그 뒤로 이루어지는 공의 이동거리는 20m란 뜻이다.

이거 알면 풀 수 있음

- dc official App