1. The problem statement, all variables and given/known data You have been visiting a distant planet. Your measurements have determined that the planet's mass is twice that of earth but the free-fall acceleration at the surface is only one-fourth as large. Radius = 1.8*10^7meters Mass = 1.19484 × 10^25 kilograms 2. Relevant equations U_g = -(G*M*m)/r v_escape = sqrt(2GM/r) 3. The attempt at a solution I just plugged in the variables to the espace velocity equation and get 94km/s, but thats incorrect.