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(A): If vecr(1) and vecr(2) be the initi...

(A): If `vecr_(1)` and `vecr_(2)` be the initial and final displacement in time t,then
`vecr_(avg)=(vecr_(2)-vecr_(1))/(t)`
(R ):The average velocity of a particle having initial and final velocity `vecv` and
`vecv_(2)` is `(vecv_(1)+vecv_(2))/(2)`, for uniform acceleration

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