20.如图所示在一根长l的轻杆上b点和末端c各固定一个质量m的小球杆可以在竖直面上绕固定a转动现将杆拉到水平位置从静止释放求末端c�到 Template




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tomski20.如图所示在一根长l的轻杆上b点和末端c各固定一个质量m的小球杆可以在竖直面上绕固定a转动现将杆拉到水平位置从静止释放求末端c�到 coloring