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Let r be the radius vector of a particle...

Let `r` be the radius vector of a particle in motion about some reference point and `r` its modulus. Similarly, `v` be the velocity vector and `v` its modulus. Then

A

`v!=(dr)/(dt)`

B

`v=(dr)/(dt)`

C

`v=|(dr)/(dt)|`

D

`|dr|!=dr`

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The correct Answer is:
A, C, D
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