[单选题]
A 2.0-kg mass is attached to tgc ku5eqo9:9s*+hf wm he end of a horizontal spring of spring constatddq/ j+qu) r6nt 50 N/m and set into simple harmonic motion with an amplitude of 0.10 m. What is the total mechanirjdqu +tq /6d)cal energy of this system?
A. $0.020 \; J$
B. $25 \; J$
C. $0.25 \; J$
D. $1.0 \; J$
