Which is the best value for the acceleration of free fall g g\,g near the Earth's surface in terms of both accuracy and precision?
(9.4±0.5) m s−2(9.4 \pm 0.5)\text{ m s}^{-2}(9.4±0.5) m s−2
(9.4±0.3) m s−2(9.4 \pm 0.3)\text{ m s}^{-2}(9.4±0.3) m s−2
(9.9±0.2) m s−2(9.9 \pm 0.2)\text{ m s}^{-2}(9.9±0.2) m s−2
(10.1±0.2) m s−2(10.1 \pm 0.2)\text{ m s}^{-2}(10.1±0.2) m s−2