What is electricity? the movement of electrons the movement of molecules the movement of circuits the movement of atoms

Electricity is defined as flow of electric charge through the conductors

So here in electricity we will define the flow of charge

in the formula of electricity we can say

as we know that fundamental form of charge is electrons

so we can say that movement of electrons are electricity in most fundamental form

so correct answer must be

the movement of electrons

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.