Suppose, the acceleration due to gravity at the Earth’s surface is 10 m/$s^2$ and at the surface of Mars it is 4.0 m/$s^2$. A 60 kg passenger goes from the earth to the mars in a spaceship moving with a constant velocity. Neglect all other objects in the sky. Which part of figure best represents the weight (net gravitational force) of the passenger as a function of time.

As the man radially moves away from earth towards mars , at a point on the line joining the centers of earth and mars , gravitational pull of earth on the man will be equal in magnitude to the magnitude of gravitational pull on the man by mars. So the weight or net gravitational force on the man must be zero. Beyond this point towards mars, weight of the man will again increase.