Position of a particle at any instant t ...

Position of a particle at any instant t is given by `vec r=3t hat i + 2t^2 haij + 5 hat k`. Its velocity at same instant will be

`4 t hai I + 5 k hai i`

`3 hai I + 4 hat j + 5 hat k`

`3 hat i +4 t hat j`

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