The Earth's electric field creates a potential that increases 100 V for every meter of altitude. If an object of charge 4.5 mC and mass 68 g falls a distance of 1.0 m from rest under the influence of the Earth's electric and gravitational fields, what is its final kinetic energy

The final kinetic energy is  

Explanation:

From the question we are told that

    The electric field is  

    The charge on the object is  

    The mass of the object is  

     The distance moved by the object is

The workdone on the object by the fields  is  mathematically represented as

Now this workdone is equivalent to the final kinetic energy so  

substituting values

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.