1. The problem statement, all variables and given/known data Three asteroids of masses M1 = 1.00 ×10^6 kg, M2 = 2.00 ×10^7 kg and M3 = 3.00 ×10^7 kg can be found at the positions r1 = (0, 0) m, r2 = (1 ×10^3, 0) m and r3 = (0, 6 ×10^2) m respectively. Calculate the resultant gravitational force on the asteroid of mass M1. 2. Relevant equations F= (G m1 m2 m3 / r^2) r (this second r with a caret ^ and in bold type, thus being a unit vector) 3. The attempt at a solution I'm usually pretty good at equations, but what has confused me is how to use the vectors in the equation. As i'm pretty sure the answer will require a vector which has a direction and magnitude, i'm not really sure where to begin with this one.