1. The problem statement, all variables and given/known data 2. Relevant equations ΔPE = G × M₁ × M₂ (1/Ri - 1/Rf) where G = gravitational constant M₁ = mass of one object M₂ = mass of the other object Ri = initial distance Rf = final distance ΔPE = -ΔKE 3. The attempt at a solution My solution is v = 2√(GM/d). I am making sure it is correct.