ANSWERS: 2

doubling amplitude or by changing either the spring constant k or mass of the spring.

A simple harmonic oscillator is anything that oscillates with an acceleration proportional to its displacement, but in the other direction. x'' =  w^2 x The solution of this equation is A cos( w (t  t0)) The maximum displacement is A. The maximum speed is A f. To double the maximum speed, double the maximum displacement A, or double the natural angular frequency of the oscillator, w. Doubling w will depend on the specific oscillator. For instance, halving the length of a pendulum, or doubling the tension in a string.
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