6. Two 5-kg objects with velocities in the unit of m/s collide and stick together. How much energy is lost in the process?
(A) 5 J
(B) 24 J
(C) 78 J
(D) 132 J
(E) 247 J

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題目解析 這道題目涉及到動量守恆與動能轉...
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