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## Homework Statement

Standing on the surface of a small spherical moon whose radius is 6.00*10

^{4}m and whose mass is 7.50*10

^{18}kg, an astronaut throws a rock of mass 2.05 kg straight upward with an initial speed 38.5 m/s. (This moon is too small to have an atmosphere.) What maximum height above the surface of the moon will the rock reach?

## Homework Equations

g=GM/r

^{2}

## The Attempt at a Solution

I calculated g, then used the kinematic equation Δy = (v

_{f}

^{2}- v

_{i}

^{2}) / 2a, but it didn't work! Did I use the wrong equations?