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並前往https://books.google.com.tw/books?id=9xH6DwAAQBAJ&pg=PA62&lpg=PA62&dq=wooden+board+vector&source=bl&ots=D5Y_u_cGPR&sig=ACfU3U2ByWNublAoGtQKzTp5zpg6WIQViQ&hl=zh-TW&sa=X&ved=2ahUKEwiTpqmkopD3AhUdzjgGHbTZDrsQ6AF6BQiQAhAD

Engineering Mechanics: Dynamics - 第 62 頁 - Google 圖書結果

... The whole of the acceleration vector is simply gravitational acceleration ... partially screwed into a wooden board (screwdriver removed for clarity).

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