Arun
Last Activity: 6 Years ago
Retardation- decrease in velocity
Deacceleration- decrease in speed.
Basically, they mean the same thing.
I believe that deceleration is the preferred scientific term when discussing a velocity change, but it is really a matter of choice.
suppose if you are discussing the thing causing the velocity decrease, "retardation" is "better", and when discussing the object which is loosing speed, "deceleration" is "better"
example...
The damper retarded the motion of the fly wheel causing the fly wheel to decelerate.