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The position vector of a particle is, ve...

The position vector of a particle is, `vecr=3thati-2t^2hatj+4hatk`. Find out
(i) its velocity `vecv` and acceleration `veca`,

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`vecr=3thati-2t^2hatj+4hatk`
`vecv=(vec(dr))/(dt)=3hati-4thatj`
`veca=(vec(dv))/(dt)=-4hatj`
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