the diagram shows two forces acting on an object the forces have magnitudes f1=3.9N and F2=1.3 what third force will cause the object to be in equilibrium

earth's neighboring galaxy, the andromeda galaxy, is a distance of 2.54×107 light-years from earth. if the lifetime of a human is taken to be 70.0 years, a spaceship would need to achieve some minimum speed min to deliver a living human being to this galaxy.