A micro-capsule of mass 5×10−6 kg5 \times 10^{-6}\text{ kg}5×10−6 kg is released from rest at the top of a vertical column of viscous glycerol. After descending a short distance, the capsule reaches a constant terminal velocity of 0.04 m s−10.04\text{ m s}^{-1}0.04 m s−1.
State the value of the acceleration of the micro-capsule as it continues to fall at this terminal velocity.