1. Tardigrade
  2. Question
  3. Physics
  4. Statement I In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision. Statement II In an elastic collision, the linear momentum of the system is conserved.

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Q. Statement I In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision.
Statement II In an elastic collision, the linear momentum of the system is conserved.

IIT JEEIIT JEE 2007System of Particles and Rotational Motion

Solution:

In case of elastic collision, coefficient of restitution $e=1$.
Magnitude of relative velocity of approach
= Magnitude of relative velocity of separation.
But relative speed of approach
$\neq$ Relative speed of separation