Directly detecting an earth-size planet around one of the nearest stars (besides the sun) is roughly equivalent to trying to take a picture of a ball point from a pen at a distance of about kilometers.

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.