Rossi decides she really wants to play volleyball now. She picks up a 0.37 kg volleyball that is initially at rest and hits it. After 0.4 seconds of contact, the ball leaves her hand with a speed of 28 meters per second. Find the magnitude of the average force exerted by the volleyball on her hand.

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.