2. a ball gets pushed off a 1.2m high table with a horizontal speed of 9ms. how far does the ball travel horizontally before hitting the ground?

The air that we breath is made mostly of which gaseous molecule

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

Aphoton is absorbed by an electron that is in the n = 3 state of a hydrogen atom, causing the hydrogen atom to become ionized. very far away from the nucleus, the released electron has a velocity of 750,000 m/s. what was the wavelength of the absorbed photon?