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範例:等加速度的多質點系統(一維)(二)

 如右圖A,B兩物體質量分別為mA=2kg;mB=3kg,t=0秒時,A200高處自由落下,同時B自地面以50m/s垂直上拋,(1)t=0,A,B的質心位置離地多高? (2)t=0,A,B的質心速度為何?質心加速度為何?(需註明方向) (3)A,B拋出後於空中相遇而黏在一起成合體,則其合體於拋出後幾秒鐘落地?(5%) (g=10m/s2)

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