Assume there is no friction in the system. At a particular point the kinetic energy of an object is 25 J and the potential energy of that object is 10 J. Therefore the total mechanical energy of the system is *

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.