Apoint moves on the x-axis in such a way that its velocity at time t (t > 0) is given by v=ln t/t . at what value of t does v attain its maximum?

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