Aman is walking on the deck of a ship in the north-east direction at a speed of 2 km/h. the ship is moving east at a speed of 4 km/h. find the speed, in km/h, of the man relative to the surface of the water.

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.