Answer:
Acceleration on the rock world will be 3 times the acceleration on the ice world
Step-by-step explanation:
Let the mass of the ice is

So mass of rock

It is given that both have same radius, let radius is r
We know that acceleration due to gravity is given by

So acceleration due to ice world
----eqn 1
Acceleration of gravity on rock world
-----eqn 2
Now dividing eqn 1 by eqn 2


So acceleration on the rock world will be 3 times the acceleration on the ice world