# Gravitational Acceleration given mass and radius

**1. The problem statement, all variables and given/known data**

If you lived on a planet with five times the mass of Earth and twice the radius, what would be the gravitational acceleration at the surface of your planet?

**2. Relevant equations**

GM/r^2

Mass of Earth = 6.00*10^24 kg

Radius of Earth = 6.38*10^3 km

**3. The attempt at a solution**

So, when I started out doing this, I quickly plugged in earth’s radius (in m), mass (in kg) and the gravitational constant just to make sure it came out at 9.8 because I know that’s what Earth’s gravitational acceleration from the surface is, but none of the answer I get are even close. I can’t even get this right and I still have to do the actual problem (using 5x the mass and 2x the radius).

http://ift.tt/1kLrHWe

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