8.2 A particle of mass m is projected with velocity V, up a plane of inclination 0° The
coefficient of friction between the particle and the plane is h By employing energy
balance, obtain an expression for the maximum distance s travelled up the plane
Find also the velocity

V2 of the particle when it returns to the point of projection

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.