7. The potential energy of a body of mass m is given by U(x) = -ax/(b²–x²), where a and b are constants. The corresponding force is:
(A)
(B)
(C)
(D)
(E)

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統計: A(0), B(0), C(2), D(0), E(0) #3384041

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#6805121
1. 題目解析 題目給定了一個質量為 \...
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