1. The problem statement, all variables and given/known data Two spherical asteroids have the same radius R. Asteroid 1 has mass M and asteroid 2 has mass 2.58·M. The two asteroids are released from rest with distance 12.35·R between their centers. What is the speed of second asteroid just before they collide? Give answer in units of (G·M/R)1/2. 2. Relevant equations Ki + Ui = Kf + Uf U= -GMm/r K= 1/2 m v^2 3. The attempt at a solution My Ki is 0. So I get 0 -GMm/r1 = 1/2 m vf^2 + -GMm/r2 r1= 12.35R r2= 2R so i solved for Vf = sqrt( 2GM (-1/ r1 + 1/r2) ) and then I get Vf = .915 (GM/R)^(1/2) What am I doing wrong, as that is the wrong anwser.