Physics
Senior High
解答よろしくお願いします！！
1 辺が 10 [cm]の正方形 ABCD の A 点に, B に向かって 4 [N]の妨
を加え, CD の中点に, 辺に直角に外向きの 3 [N]の力を加えた』
のときの合力の大きさと, 合力の作用線が辺 BC を通る点
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