Diagram shows two balls released from a device at the same time. the ball on the left falls freely from rest, and the ball on the right is launched horizontally which best compares the vertical motion of the two balls?

a)both balls have constant velocity and are acted on by gravity.
b)both balls are acted on by gravity and are accelerating downward.
c)both balls are pulled downward and have zero acceleration.
d)both balls have zero acceleration and have constant velocity.

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.