A block is attached to a horizontal spring. On top of this

Chapter 10, Problem 10.49

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A block is attached to a horizontal spring. On top of this block rests another block. The two-block system slides back and forth in simple harmonic motion on a frictionless horizontal surface. At one extreme end of the oscillation cycle, where the blocks come to a momentary halt before reversing the direction of their motion, the top block is suddenly lifted vertically upward, without changing the zero velocity of the bottom block. The simple harmonic motion then continues. What happens to the amplitude and the angular frequency of the ensuing motion? (a) The amplitude remains the same, and the angular frequency increases. (b) The amplitude increases, and the angular frequency remains the same. (c) Both the amplitude and the angular frequency remain the same. (d) Both the amplitude and the angular frequency decrease. (e) Both the amplitude and the angular frequency increase.

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