Electrons flowing along a copper wire is an example of what type of energy

In microscopic way we can say it is Kinetic Energy of electrons or in other words the rate of flow of charge is electric current so it is also known as electrical energy

Explanation:

As we know that electrons are flowing along the length of conductor so here total energy of all the electrons is sum of kinetic energy of electrons.

Here we can say that rate of flow of charge is known as electric current so here the we can say

so here net flow rate of charge will give us electric current due to which energy associated with it is given as

so here energy due to flow of charge is either sum of kinetic energy of all electrons or it is electrical energy.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

3. dark matter

empty space could also be a simple vacuum