[問題] 簡諧運動問題+證明
A sphere of mass=m, is attached to an elastic cord of constant=k,
which is underformed when the sphere is located at the origin O.
Knowing that the sphere may slide without friction on the
horizontal surface and the position show its velocity=v
中文翻譯大概:一個物體質量m被一個彈性繩彈力常數k綁住，
物體聚有初速v繞著圓點開始旋轉時會改變繩長，
然後物體繞的平面無摩擦。
想問說:物體繞著圓點旋轉時在平面會是一個"橢圓軌跡"的運動
那要如何證明說這軌跡是橢圓的呢？
謝謝幫忙解答！
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