The answer is: Motion!
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Answer:
The correct answer is d
Explanation:
In this exercise they ask us which statement is correct, for this we plan the solution of the problem, this is a Doppler effect problem, it is the frequency change due to the relative speed between the emitter and the receiver of sound.
The expression for the Doppler effect of a moving source is
f ’= (v / (v- + v_s) f
From this expression we see that if the speed the sound source is different from zero feels a change in the frequency.
The correct answer is d
The total work done is equal to 134 J.
<h3>Work</h3>
The work formula is characterized as the multiplication of the force performed and the distance in which the movement was performed, so that:

Thus, it is enough to calculate the value of the work in each movement and add to find the total work, so that:


So, the total work done is equal to 134 J.
Learn mor about work in: brainly.com/question/4095205
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