How do i use law of superposition everyday

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

How would doubling the made of an object change the objects potential energy

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.