Aball is dropped from rest at point o . it passes a window with height 3.8 m in time interval tab = 0.02 s. identify the correct pair of equations, which enable us to solve for speed vb . assume down is the positive y direction. use g = 9.8 m/s 2 . k~vk = v is the speed of the ball.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

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

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories