Question

# Assertion :In an elastic collision between two bodies, the relative speed of the bodies after collision is equal to the relative speed before the collision. Reason: In an elastic collision, the linear momentum of the system is conserved.

A
Statement -1 is True, Statement-2 is True; Statement -2 is a correct explanation for Statement-1.
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B
Statement -1 is True, Statement-2 is True; Statement -2 is NOT a correct explanation for Statement-1.
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C
Statement -1 is True, Statement-2 is False.
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D
Statement -1 is False, Statement-2 is True.
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Solution

## The correct option is B Statement -1 is True, Statement-2 is True; Statement -2 is NOT a correct explanation for Statement-1.In Collisions:1. Momentum is conserved both in elastic and inelastic collisions. 2. Kinetic Energy is also conserved in elastic collisions. Point 1 leads to Statement 2, i.e, 'In an elastic collision, the linear momentum of the system is conserved. Point 2 leads to Statement 1, i.e, 'In an Elastic Collision between 2 bodies, the relative speed of the bodies after the collision is equal to the relative speed before the collision'.Thus, both Statement 1 and Statement 2 are true, but Statement 2 is not the reason for Statement 1.

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