How Is Energy Transformed?

With explanation pls

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

What is the major limitation to the light microscope?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=