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[" A particle is projected along a horiz...

[" A particle is projected along a horizontal field whose coefficient of friction varies as "mu=A/r^(3)" where "],[r" is the distance from the origin in metres and A is a positive constant.The initial distance of the "],[" particle is "1m" from the origin and its velocity is radially outwards.The minimum initial velocity at "],[" this point so that particle never stops is "]

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