1.

Let bar(v)(t) be the velocity of a particle al lime t. Then :

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`|dbar(V)(t)//DT|and d|bar(v)(t)|//dt|"are ALWAYS equal"`
`|dbar(v)(t)//dt|and d|bar(v)(t)|//dt|",may always equal"`
`|dbar(v)(t)//dt |"can be zero while"and d|bar(v)(t)|//dt|",is not zero"`
`|dbar(v)(t)//dt|ne0"IMPLIES " |d bar(v)(t)//dt|ne0 `

Answer :B::C::D


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