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.
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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