# How fast do things fall?

###### Wiki User

###### February 10, 2011 1:44AM

The speed that things fall to the earth depends on two things, how fast they started falling and how long they have been falling. The equation for finding that speed, v, is:

v = v0 + a*t

where v0 is the initial speed something began falling, a is the acceleration or change in velocity is causing it to fall, and t is the time it has been falling. If the object is falling on the earth, the acceleration due to gravity is 9.8 m/s2. So, if you drop something off a very tall building by just letting it go, letting v0 = 0, then after 10 seconds, it will be moving at 98 m/s. The weight of the object only matters if there is air resistance.