[单选题]
A 2.0-kg mass is attached tq xg:y,08znyq (:fgibo the eniem6 a4+a. w*j xoyud2ctv79xd of a horizontal spring of spring constant 50 N/m and set into simple harmonic motion with an amplitude of 0.10 m. What ist27*y4 +jav d9xi 6coa u.wmex the total mechanical energy of this system?