A remote-controlled helicopter flew 515meters west at a constant velocity. It flew that distance in 50.0seconds. What was the helicopter's velocity? HELP ASAP BEING TIMED

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.