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  4. A particle of mass M is moving in a horizontal circle of radius R with uniform speed v. When it moves from one point to a diametrically opposite point, its

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Q. A particle of mass $M$ is moving in a horizontal circle of radius $R$ with uniform speed $v$. When it moves from one point to a diametrically opposite point, its

AIPMTAIPMT 1992Work, Energy and Power

Solution:

On the diametrically opposite points, the velocities have same magnitude but opposite directions. Therefore change in momentum is
$Mv - (-Mv) = 2Mv$