A 1 kg object at rest is hit by a 2 kg object moving at 3 m/s. If the collision is elastic and the 2 kg object is now moving at 2 m/s, how fast is the 1 kg object moving after they hit?

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Part 1: a magnetic levitation or maglev train rides rails without touching them. explain how this works using your data. include the appropriate magnet drawing in your answer. part 2: two objects are near a bar magnet. one is about 1 cm away, while the other is 6 cm away. compare and contrast the magnetic force that affects each object. use your data to answer the question