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**1. Homework Statement**

A hypothetical planet has a radius 2.5 times that of Earth, but has the same mass. What is the acceleration due to gravity near its surface?

R(earth)= 6.38 x 10^4 m

M(earth)= 5.98 x 10^24 kg

G= 6.67 x 10^-11

**2. Homework Equations**

g=GM/r^2

**3. The Attempt at a Solution**

I did: (6.67 x 10^-11)(5.98 x 10^24kg) / [2.5(6.38 x 10^4m)]^2

and got 15,708, but know this is wrong since the answer is near only 15.