If we knew that a distant galaxy were 9.28 x 1021 meters away from earth, what velocity could we expect to measure for the galaxy in km/s?

Can someone explain to me how to do this problem ?

Two friends are having a conversation. anna says a satellite in orbit is in freefall because the satellite keeps falling toward earth. tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . who do you agree with and why?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance