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[" A body of mass "m" is moving in a cir...

[" A body of mass "m" is moving in a circle of "],[" radius "r" with a constant speed "v" .The force on "],[" the body is "(mv^(2))/(r)" and is directed towards the "],[" centre.What is the work done by this force in "],[" moving the body over half the circumference "],[" of the circle "],[" (1) "(mv^(2))/(-m)]

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