$$8.9 \, \text{m/s}^2$$

$$9.8 \, \text{m/s}^2$$

$$10.8 \, \text{m/s}^2$$

$$11.8 \, \text{m/s}^2$$

$$g = \frac{G \cdot M}{r^2}$$

$$g = \frac{M \cdot r}{G^2}$$

$$g = \frac{G \cdot r}{M^2}$$

$$g = \frac{M^2}{G \cdot r}$$

質量越大，重力越小

質量越小，重力越大

質量與重力無關

質量越大，重力越大

$$98 \, \text{N}$$

$$9.8 \, \text{N}$$

$$980 \, \text{N}$$

$$0.98 \, \text{N}$$