Answer:
I think like 2024 or 25
Explanation:
Elon musk will probably go
"<span>All waves have frequency, wavelength, speed and amplitude." </span>
You multiply the mass by the acceleration 82*7.5=615; that's what I would do
It is called air pressure
Let vb be the velocity of the motorboat and let vs be the velocity of the stream.
We know that when she drives upstream the velocity is 8 m/s, in this scenario the velocities point in opposite directions, then we have the equations:

When she drives downstream the velocites point in the same direction then we have the equation:

hence we have the system of equations:

Solving the first equation for the velocity of the boat we have:

Plugging this in the second equation we have:

Therefore, the velocity of the stream is 2 m/s