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A body can be considered as rigid if If this condition is satisfied the body can be analyzed as a rigid body Frames of references In the kinematic analysis , most of the quantities are vector quantities ( e.g. position , velocity , acceleration etc. ) So we may require a frame of reference to define a vector .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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