Two birds walked across the carpet and became statically charged with a charge +q and −q respectively. They then flew up to their square perch and landed on opposite corners. If a third bird with some net charge landed on the perch, would it have a greater electric force on the other birds if it landed in the center of the perch or on one of the other corners?

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.