Astone tumbles into a mine shaft and strikes bottom after falling for 4.2 second how deep is the mine shaft

Zamir and talia raced through a maze. zamir walked 2 m north, 2 m east, 4 m south, 2 m east, 4 m north, 2 m east, 3 m south, 4 m east and 4 m north. talia walked 2 m north, 6 m east, 3 m south, 4 m east, and 4 m north. compare their displacements:

Which two particles are found in the center of an atom

How many atoms of nitrogen are in the chemical formula ni(w on