A salmon jumps 2.0 m vertically and gains a certain amount of potential energy. A secondsalmon of half the mass jumps the same vertical height. Compared to the first salmon, thesecond salmon’s potential energy gain is? a. one-half as great b. twice as great c. the same d. 4 times as great

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.