How to find distance with only time

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

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.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2