L26 : Kinetics of body
Translation:
In rigid body translation in plane motion, every line in a translating body remains parallel to its original position at all times. In rectilinear translations all points move in straight lines, whereas in curvilinear translation all points move on congruent curved paths.
Click below to see rectilinear translation.
Click below to see curvilinear translation.
For both the translations, 
and 
.
Therefore for translational body,
