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Which of the following option//s are cor...

Which of the following option//s are correct :

A

`|(doverset(vec)V)/(dt)| =` mangnitude of instantaneous acceleration

B

`|(doverset(vec)r)/(dt)| =` magnitude of instantaneous velocity

C

`(d|overset(vec)V|)/(dt) =` magnitude of instantaneous speed

D

average speed is always greater than zero

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The correct Answer is:
A, B
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