Is velocity calculated only for a straight line? 

Dear student,
Your question is not clear and appears to be incomplete.
As we know, velocity can be calculated from the slope of displacement time graph. As it seems like your question is a part of any derivation or any different question, so please repost the entire doubt.

Recheck your question or please be a little specific about the name of the chapter/textbook to which you are referring here so that we can provide you with some meaningful help. Look forward to hearing from you again!
Regards

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