Can someone help me pls???

Modify the equation fδt=δ (mv) to find the force of friction.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

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.