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JEE Main 2015 Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main 2015

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:

Answer: (4)

Solution

Momentum: and . The combined mass is 3m, so . Initial KE $=

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Question ID VK-115138