The cart has a mass of m and is attached to two springs, each having a stiffness of k1 = k...

The cart has a mass of m and is attached to two springs, each having a stiffness of k1 = k2 = k, unstretched length of l0, and a stretched length of l when the cart is in the equilibrium position. If the cart is displaced a distance of x = x0 such that both springs remain in tension (x0< l – l0), determine the natural frequency of oscillation.