It is a stretch of the atmosphere ranging from the upper mesosphere to the lower parts of the thermosphere. It’s useful to us in radio communication.
I think option C is correct..hope it helps
It would be both speed and direction depending on the man's swing
Answer: The average velocity is 150 km/h
Explanation: 70+80=150
The kinetic energy of the electron is

where

is the mass of the electron and v its speed. Since we know the value of the kinetic energy,

, we can find the value of the speed v: