" <em>Energy is never created or destroyed.</em> "
All the rest is commentary.
Explanation:
Given that,
Mass of the object, m = 7.11 kg
Spring constant of the spring, k = 61.6 N/m
Speed of the observer, 
We need to find the time period of oscillation observed by the observed. The time period of oscillation is given by :
Time period of oscillation measured by the observer is :
So, the time period of oscillation measured by the observer is 5.79 seconds.
Answer: The result of "the upper bound of the density" does not go on the denominator.
So simplified, no. The answer is no.
It’s the crest, the crest is the top part of the wave and the trough is the bottom so they correspond
When two or more waves meet, they interact with each other. The interaction of waves with other waves is called wave interference. Wave interference may occur when two waves that are traveling in opposite directions meet. The two waves pass through each other, and this affects their amplitude.
