WILL DO BRAINLEYEST 40 PTS An oceanic vessel surveys the ocean floor using ultrasonic waves. The ocean beneath the boat is 4600 meters deep. If the ultrasonic wave travels to the bottom of the ocean and back to the boat in 6 seconds, what is its average speed?
A) 770 m/s
B) 1530 m/s
C) 7700 m/s
D) 27600 m/s

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answer: d.) the total number of protons and neutrons is 15

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the car was traveling 40 mph before it started skidding. ( 2 points ) 17. was the driver were her brakes working at 75% efficiency or better? ( 2 points ) yes 29.

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