The amplitude and time period of a aprticle of mass `0.1kg` executing simple harmonic motion are `1m` and `6.28s`, respectively. Then its angular frequency and acceleration at a displacement fo `0.5m` are respectively
A. `1 rad//s, 0.5 m//s^(2)`
B. `2rad//s, 1m//s^(2)`
C. `0.5 rad//s, 0.5m//s^(2)`
D. `1rad//s, 1m//s^(2)`
