A particle undergoing simple harmonic motion has amplitude 10cm and time period 2.0s. At t=0 its displacement is 6cm and its velocity is −0.25ms−1. Determine the acceleration of the particle at t=0.50s.
(a) −0.79ms−2
(b) +0.62ms−2
(c) +0.79ms−2
(d) −0.99ms−2