A particle is moving such that its position vector varies with time as r→=1-αttA→ where α and A→ are constant quantities. At t = 0, the particle is at a position O. At some later instant 't0' , the particle is again at O. Velocity of the particle at the instant t0 is:

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2A→

A→

-A→

-2A→

answer is C.

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Detailed Solution

v→=dr→dt=1−2αtA→Also,t0=1αso v→=−A→

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