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38. A particle of mass m is attached to a spring with a force constant k. The motion of the particle is described by x(t) = 10sin(πt). At what point does the potential energy of the particle equal its kinetic energy?
(A)πs
(B)0.5 s
(C)1.0s
(D)1.5 s
(E)一律給分
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統計: A(1), B(0), C(0), D(0), E(5) #3091956
統計: A(1), B(0), C(0), D(0), E(5) #3091956