A 0.5 kg drone traveling 15 m/s crashes into a tree. What is the momentum of the drone before and after the crash?

A) 7.5 kg • m/s before and 0 kg · m/s after

B) 30 kg - m/s before and 0 kg • m/s after

C) 0 kg • m/s before and after due to the crash

D) 7.5 kg · m/s before and after

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.