If no net force acts on a body that is already in motion at a constant a. the velocity of the body is constant b. the body is accelerating c. the momentum of the body is zero d. the momentum of the body is increasing i think the answer is a, but double check and explain how you know! tysm!

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

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

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.