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Assertion: For a particle moving in a st...

Assertion: For a particle moving in a straight line velocity (v in m//s) of the particle in terms of time (t in sec) is given by `v = t^2 - 6t + 8`. Then the speed of the particle is minimum at `t = 2 sec`
Reason: For a particle moving in a straight line line velocity `v` at any time `t` may be minimum or may be maximum when `(dv)/(dt) = 0`.

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