本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理
[问答题]
A vertical spring with spring stiffneajb( tq6 s;mci7,rk50ih*ypr ss consyh1))ch 5q ;qi gw4qzktant 305 N/m vibrates with an amplitudez)iqkq5)gycw hq;1 h4 of 28.0 cm when 0.260 kg hangs from it. The mass passes through the equilibrium point (x=0) with positive velocity at
(a) What equation describes this motion as a function of time?
(b) At what times will the spring have its maximum and minimum extensions?
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