An athlete participating in cross-country spends the afternoon practicing, and at the end is completely exhausted from all the hard word, even though their average velocity during the practice was 0 m/s. Explain how this situation is possible.

please find the answer in the explanation

Explanation:

Velocity is the distance covered in a specific direction per time taken.

And in velocity, we have final velocity V and initial velocity U.

The definition of average velocity is:

Average velocity = (V + U)/2

Since velocity involves direction, if the initial velocity U is of the same magnitude as the final velocity V and both are of opposite direction. Then,

Average velocity = (-U + V)/2

Since they are of the same magnitude,

V = U.

Therefore,

Average velocity = (-U + U)/2 = 0

the answer is b

explanation:

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods