Consider two isolated conductive metal spheres. each carries the same amount of excess charge +q, but one has a radius that is five times greater than the other.

how does the electrostatic potential of the two spheres compare?

Electric potential of the second conductive metal sphere will be times than first conductive metal

Explanation:

We have given that there are there are two isolated conductive metal surfaces each have charge +Q

And one has radius 5 times greater than second

Now we know that electric potential due to conducting sphere

As from the relation we can see that electric potential is inversely proportional to the radius of the sphere

So electric potential of the second conductive metal sphere will be times than first conductive metal

0.11 m/s and 0.28 m/s should be correct

this could be newton#'s law of cooling. the cooling curve is exponential