Everything on Earth (buildings, airplanes, us) is struggling against its unrelenting downward pulling force.

Including anything you toss/shoot up.

*-16t ^{2}* +

height (in feet) of an object (ball, bullet, rock etc)

thrown/fired straight up with initial velocity *v _{0}*
(in feet per second)

from an initial height

(ignores air resistance!)

Examples:

*-16t ^{2}* +

initial velocity: 10 ft/s starting height: 50 ft above ground

What is the object's height after t= 1, 2, 3 seconds?

*-16t ^{2}* +

initial velocity: 146 ft/s (about 100MPH) from ground (

What is the object's height after t= 1...10 seconds?

*-16t ^{2}* +

initial velocity: 0 ft/s (

What is the object's height after t= 1...6 seconds?

Height is 0 when the object has landed.

*-16t ^{2}* +

Solving this quadratic equation gives the value(s) of t when the object is on the ground.