試題詳解

2. A mass m is attached to a spring with spring constant k (the other end of the spring is Exed). The mass of the spring is negligible. When the mass moves at velocity v, there is a drag force -bu acting on the mass.
Which figure describes the displacement x of the mass as a function of time for some initial condition under the condition that the oscillator is overdamped?
(A)
(B)
(C)
(D)
(E) none of the above