alight aircraft stands at rest on the ground it stands on three wheels one at the front and two further back which point could be its centre of mass​

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?