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The position vector of a moving particle...

The position vector of a moving particle at 't' sec is given by `vec r=3hat i+4t^(2)hat j-t^(3)hat k` .Its displacement during an interval of t =1 s to 3 sec is
(A) `hat j-hat k` (B) `3hat i+4hat j-hat k`(C) `9hat i+36hat j-27hat k` (D) `32hat j-26hat k`

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