24. A 1.0-kg block and a 2.0-kg block are pressed together on a horizontal frictionless surface with a compressed very light spring between them. They are not attached to the spring. After they are released and have both moved free of the spring
(A) both blocks will have equal speeds.
(B) the magnitude of the momentum of the heavier block will be greater than the magnitude of the momentum of the lighter block.
(C) the lighter block will have more kinetic energy than the heavier block.
(D) the heavier block will have more kinetic energy than the lighter block.
(E) both blocks will both have the same amount of kinetic energy.

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詳解 (共 2 筆)

#6995552
1. 題目解析 這道題目涉及到動量和動...
(共 1086 字,隱藏中)
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#7410395
所以看到無摩擦、內部彈簧推開、初始靜止
可以直接判斷動量守恆
然後動能的公式和動量的關係
6a313ce1931da.jpg
所以由公式可以得到同等動量下,m越小動能越大
ㅤㅤ
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