A)under what conditions velocity becomes variable and when is average velocity equal to average speed
Condition for variable velocity : When a body covers unequal displacements in equal interval of time.
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Kindly refer to the link given below to get your answer :
https://www.meritnation.com/ask-answer/question/under-what-condition-s-is-the-magnitude-of-average-velocit/motion/6290841