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A particle of mass m moving in the x direction with speed $2v$ is hit by another particle of mass 2m moving in the y direction with speed v. If the collision is perfectly inelastic , the percentage loss in the energy during the collision is close to :

$\begin{array}{1 1} 50 \% \\ 56\% \\ 62\% \\ 44 \% \end{array} $

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