A parachute opens and changes speed from 85mph to 45 mph in 30 min. What is acceleration

How do you tell if someone actually cares about you? and just say they do?

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.

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion