The four kinematic equations which describe an object's motion are:. There are a variety of symbols used in the above equations and each symbol has a specific meaning. d – the displacement of the object. (we use “x” & will also use “y”) t – the time for which the object moved.
If there is NO AIR RESISTANCE ALL objects, regardless of weight & size, will fall at the same acceleration.
The Acceleration of gravity:
g= -9.81 m/s/s
The NEGATIVE displacement, indicates that the object is falling DOWN