Drawings that represent the areas taken up by the various body parts on the motor cortex appear distorted because they are based on which of the following aspects regarding these body parts?

Could someone . i have tried to solve myself but my calculation is off

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?