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[" 76.A particle moves in "xy" plane.The...

[" 76.A particle moves in "xy" plane.The position vector at any "],[" time "t" is "vec r={(2t)hat i+(2t^(2))hat j}m" .The rate of change of "],[theta" at time "t=2" second (where "theta" is the angle which its "],[" velocity vector makes with positive "x" -axis) is "]

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