Resistance is current x potential difference. So therefor run wafff
To develop this problem it is necessary to apply the concepts related to Sound Intensity.
By definition the intensity is given by the equation

Where,
I = Intensity of Sound
= Intensity of Reference
At this case we have that 15 engines produces 15 times the reference intensity, that is

And the total mutual intensity is 100 dB, so we should




Therefore each one of these engines produce D. 88dB.
Moment is mass times speed
INITIAL moment before collision was 20 000 times 25 = 500 000
Answer: B (on the rough side)
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