The gravitational constant should have units m^3/kg/s^2 not m^3/kg/s. This will asure that v_earth will have a unit of m/s. To transform this unit to km/h you have to multiply by 3.6. This gives us a speed of 40'255 km/h. I cant't figure out where the 671 km/h comes from.

## units and result should be different

The gravitational constant should have units m^3/kg/s^2 not m^3/kg/s. This will asure that v_earth will have a unit of m/s. To transform this unit to km/h you have to multiply by 3.6. This gives us a speed of 40'255 km/h. I cant't figure out where the 671 km/h comes from.

Regards, daCake