1. The problem statement, all variables and given/known data A 250-kg space probe weighs 935 N on the surface of Mars. What is the gravitational field strength on the surface of Mars? 2. Relevant equations W=mg g=Gm1/r^2 Fg=Gm1m2/r^2 3. The attempt at a solution Okay, so at first I thought it would be: g=(6.67x10^-11)(6.42x10^23)/(3.38x10^6)^2 g=3.75 m/s^2 BUT Then I remembered the weight of the probe...What do I do with that? Oh wait, brainflash. If I went W=mg and changed it to g=W/m g=935N/250kg =3.74 m/s^2 ...So which answer is right?