The asteroid 234 ida has a mass of about 4x10^16 kg and an average radius of about 16 km. The acceleration due to gravity at the earth`s surface is 9.8 m/s^2. what is the acceleration due to gravity on the moon`s surface?
a. 9.58 m/s^2
b. 2.8 m/s^2
c. 1.9 m/s^2
d. 3.0 m/s^2