I think its " both have level surfaces"
By dropping a ball and seeing how long it takes to hit the ground or throw a ball up and time it as well
Answer:

Explanation:
First of all, let's convert from nanometres to metres, keeping in mind that

So we have:

Now we can convert from metres to centimetres, keeping in mind that

So, we find:

Conductors allow<span> for </span>charge<span> transfer </span>through<span> the free movement of </span><span>electrons
</span>
Power is the rate at which work is done (2nd option)