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**1. Homework Statement**

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. Homework 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.