aydanbelle
19.05.2020 •
Physics
A large boulder falls from an underwater ledge and crashes on the floor of the ocean. A pod of dolphins is 800 meters away. Determine how long it takes for the sound of the crash to reach the dolphins.
0.5 sec
0.3 sec
2.3 sec
1.9 sec
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Ответ:
yes
Explanation:
because electricity is a positive and negative proton