Question

Assertion (A) : When a particle of certain mass collides with identical particle at rest, the two particles move,after perfectly elastic collision, in a mutually perpendicular direction, if it were not a head-on collision.
Reason (R) : Both momentum and KE are conserved in the case of perfectly elastic collision.

• A. Both Assertion (A) and Reason (R) are correct and R is the correct explanation
• B. Both Assertion (A) and Reason (R) are correct but the reason does not give the correct explanation
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is A Both Assertion (A) and Reason (R) are correct and R is the correct explanation

Assertion statement is true that two identical particles move at right angle to each other after a perfectly elastic oblique collision if the second particle is at rest initially. Reason statement is also correct that linear momentum and kinetic energy of the system is conserved in perfectly elastic collision. The particle move perpendicular to each other so as to conserve the linear momentum and kinetic energy.

Thus option A is correct.