An ice skater with a mass of 60 kg is initially at rest on the ice, holding a basketball with a mass of 7.3 kg. If the skater throws the ball at a velocity of 12.4 m/s, what will the skater’s velocity be?

The air that we breath is made mostly of which gaseous molecule

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.

Two trains leave a station at the same time, train a travels at a constant speed of 16 m/s. train b starts at 8.0 m/s but accelerates constantly at 1.0 m/s squared. after 10.0 seconds, which train has the greater speed?