M=mass=9.23 x 10^20 kg
R=radius= 474 Km=474000m
a) we will use the next formula
F is the force of attraction
G is the universal gravitational constant
M is the mass of the larger object and
m is the mass of the smaller object
R is the distance
Using the formula of Newtons second law
we have
we simplify
we can change a by g
We substitute the data
b.
m=64.5 kg
In order to calculate the weight, we will use the next formula
we substitute the values
ANSWER
a. g=0.274 m/s^2
b. 17.7N