Sunee is competing in 5 km (5000m) race. She runs 4902 m at a B velocity of 4.3m/s when sees the finish line. She increases her pace and accelerates at a constant rate until she crosses the finish line 19.4s later. What is her acceleration rate when saw the finish line?

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.