Answer:
Force = mass × acceleration
Acceleration:

From first Newton's equation of motion:
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Change = v - u:

D.<span>Wave 3 resulted from constructive interference, and Wave 4 resulted from destructive interference.
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Im pretty sure it’s a because it makes more sense you know?.
The kilogram is the Standard International System of Units unit of mass. It is defined as the mass of a particular international prototype made of platinum-iridium and kept at the International Bureau of Weights and Measures.