Published by:
CGP EDU Academic Team
Published on: September 13, 2026
A particle of mass m is moving along the x -axis with initial velocity 
. It collides elastically with a particle of mass 
at rest and then moves with half its initial kinetic energy (see figure). If 
then value of n is
Text Solution
Verified by ExpertsThe correct answer is:
10
(10) JEE Main 2020
since energy of m reduced by half
and 
Now, momentum in y direction will remain conserved
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