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The position vector of a particle is giv...

The position vector of a particle is given by
`vecr=3.0t hati-2.0t^2hatj+4.0hatk m`
Where t is in seconds and the coefficients have the proper units for `vecr` to be in metres.
(a) Find the `vecv and veca` of the particle ?

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The correct Answer is:
`v(vect)=(3.0hati=4.0t hatj),veca(t)=-4.0hatj`
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