Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.…

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Body P having mass M moving with speed u has head-on collision elastically with another body Q having mass m initially at rest. If mM, body Q will have a maximum speed equal to 2u after collision.

Reason R : During elastic collision, the momentum and kinetic energy are both conserved.

In the light of the above statements, choose the most appropriate answer from the options given below:

  1. A is correct but R is not correct.
  2. A is not correct but R is correct.
  3. Both A and R are correct and R is the correct explanation of A
  4. Both A and R are correct but R is NOT the correct explanation of A

Solution

For e=1 & second body at rest

V2=2m1u1 m1+m2=2uMM+m2u

Since M>>m

Asked in: JEE Main 2021 (26 Feb Shift 1)

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