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# In an elastic collision between two bodies, during the time collision is taking place, which physical quantity is conserved?

$\begin {array} {1 1} (a)\;KE & \quad (b)\;momentum \\ (c)\;both\; momentum\; and\; kinetic \;energy & \quad (d)\;none\;of\;the\;above \end {array}$

During the time of collision , Only momentum is conserved . As deformation taking place, some amount of kinetic energy gets converted into potential energy of deformation.