What formulas can you use to solve for velocity, given displacement and time?

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

What is the final velocity of the initial velocity of 25 and -50?

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