A block of mass M=2kg is connected by three identical springs of spring constant K to the fixed support as shown. Assume that all springs are linear and identical and have their un-stretched length at the equilibrium position. Only small horizontal motion of x(t) is considered. No energy dissipation is considered

\f4 3 2 *(1) (in cm) O -1 -2 -3 -4 O 2 4 6 8 10 12 14 16 18 20 time (in second)