Explain the term "avalanche state"

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

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.