Shelley gives her little sister a 5-meter head start in a bike race. the race ends 15 meters east from where shelley started. if her little sister completes the race in 5 seconds, what is her sister’s average velocity? (round your answer to the nearest whole number.)

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.