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簡諧運動是往復的,設其位移方程為x=Asin(wt+a)(cm)期中w=2π/T=π/2,將A=24,t=0,x=12代入方程求得a=π/6,即位移方程為x=24sin(πt/2+π/6)(cm),令x=0求得t的最小值為5/3s
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