From her bedroom window a girl drops a water-filled balloon to the ground. /it spats on the ground 1.3 s. later. how fast was the balloon falling? how high up was the window?

Gas will most likely  fill the container 

Answer ( slope);

//(b) both involve the use of levers;

In atoms, the electron carries a negative elementary or unit charge; the proton carries a positive charge. the two types of charge are equal and opposite. in an atom of matter, an electrical charge occurs whenever the number of protons in the nucleus differs from the number of electrons surrounding that nucleus.