A4 kg car with frictionless wheels is on a ramp that makes a 25° angle with the horizontal. the car is connected to a 1 kg mass by a string that passes over a frictionless pulley. what is the acceleration of the car?

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.