[单选题]
A 4.0-kg object is attached to a spring of spring constant 10 N/m. The (cm qlh .jsrd 1v127zfobjq xh-o5y-(quaby h5fj)2yy0sect isqj-sy 0)oy ya xfyq(hu 5bh-52 displaced by 5.1 cm from the equilibrium position and let go. What is the frequency of vibration?
A. $0.25 \; Hz$
B. $0.50 \; Hz$
C. $1.0 \; Hz$
D. $2.0 \; Hz$
