A 7000kg truck of 125 km. h-1 is moving north and collide with a 7000g car which moves with 19.m. s-1 south. after collision the truck moves with 98km. h-1.calculate velocity of the car after collision ​

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.