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[" 39.A particle of mass "m" moves along...

[" 39.A particle of mass "m" moves along a circular path of radius "],[r" with a centripetal acceleration "a_(n)" changing with time "t],[" as "a_(n)=kt^(2)," where "k" is a positive constant.The average "],[" power developed by all the forces acting on the particle "],[" during the first "t_(0)" seconds is "],[[" a."mkr_(0)," b."(mkr_(0)^(2))/(2)],[" c."(mkr_(0))/(2)," d."(mkr_(0))/(4)]]

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