If a dense, 20.0-kg object is falling in air at half its terminal velocity, what is the drag force on the object at this moment

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

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

The heliocentric and the geocentric models of the solar system included these central principles