Physics
Senior High
解説お願いします
リU.W
しょ owls
2 静水中を3.0 (m/s)の速さで泳ぐことのできる人が、流速1.0 (m/s)の川を上
流と下流の間の距離30mを泳いで往復するとき、何秒かかるか。
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