Principle of momentun and upthrust

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.

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest