2. Meg walked 200 m east from her house to Amy's house. She then walked 500
m west to the library. From the library, Meg walked 300 m east back home,
a) Draw a vector diagram to represent Meg's motion. Use the diagram to find mega displacement

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

measuring things 1 litre of water

friction

explanation:

they us to move forward and backwards