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In a particle accelerator, the position ...

In a particle accelerator, the position vector of a particle is initially estimated as `vecr=6.0hati-7.0hatj+3.0hatk` and after 10 s, it is estimated to be `vecr=-3.0hati+9.0hatj-3.0hatk`, all in meters. In unit vector notation, what is the average velocity of the particle?

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`(-0.90hati+1.6hatj-0.60hatk)m//s`
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