If I tell you that I traveled 30 miles in the last 2 hours, the only thing you can calculate is my average speed during those two hours. You can't tell anything about my acceleration or the direction in which I traveled.
The answer to this question would be A. Interference. This is because when two sounds with slightly different frequencies creates a periodic variation in volume.
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Explanation:
The inertia of the ketchup will keep it from moving if it isn't too tightly adhered to the sides of the moving bottle.
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idk b idk ssry dude good luck tho