The mass of earth is 80 times that of moon and its diameter is double that of moon. If the value of acceleration due to gravity on earth is 9.8m/s², then the value of acceleration due to gravity on moon will be
1. 0.98 m/s²
2. 0.49 m/s²
3. 9.8 m/s²
4. 4.9 m/s²