I believe the answer is A) Less work in less time.
Answer: two waves with identical crests and troughs meet
Explanation:
My teacher gave me the answer
Answer:reflection by dust particles in air
Newton's 3 laws are...
inertia: things tend to continue to do what they are doing.
Change: to make something change you need a force to change it. the force needed = the mass times its acceleration
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Resistance: When you push on something, it pushes back.
From yahoo answers
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I think number 1 is incorrect I believe that answer is D. Number 6 I believe would be B. The rest seem to be correct.