A.(a)1s;(b)0.00248cmB.(a)1s;(b)0.00124cmC.(a)0.5s;(b)0.00248cmD.(a)0.5s;(b)0.00124cm
A.(a)1000Ns/m;(b)4.2154B.(a)500Ns/m;(b)4.2154C.(a)1000Ns/m;(b)3.6276D.(a)500Ns/m;(b)3.6276