What are the two things produced during a collision?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

Most of the volume of an atom is occupied by the

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force