it is very simple...........
velocity or speed = distance / time.
acceleration = velocity / time
but, we know that velocity = distance / time
so just substitute the equation of velocity in acceleration......
so, finally we get ,
acceleration = distance/time*time
so it is time squared.
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Acceleration is measured in (distance) per (unit of time) squared; for example, feet/second squared in the SI (metric) system the official unit is metres/second/second or metres/(second squared)
9.8 meters per second squared is the acceleration of gravity.
-6.667 miles per second squared
Acceleration is a change in velocity per unit of time. Velocity is distance (d) per unit of time (t). That makes acceleration distance per unit of time squared, or something like this:We have distance/time2, or d/t2Distance is commonly measured in meters, and time in seconds. This makes acceleration appear in meters per second per second, or meters per second squared, or m/sec2.m/s2meters per second squared
Acceleration due to gravity is approximately 386.09 inches per second squared. This value represents the rate at which an object accelerates towards the Earth when in free fall. It is a constant value near the surface of the Earth and is denoted by the symbol "g."