[问答题]
A mass m is connected to two springs, withhgs qwgu-3na6 :*tkn4 spriibo(ft w/ ya9orf5 goa(i c/-.ng stiffness constants $k_1$ and $k_2$ as shown in Fig. 11–51. Ignore friction. Show that the period is given by
T=2 $\pi \sqrt{\frac{m}{k_{1}+k_{2}}}$ .
