How are the galaxies moving in our universe ?

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

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.