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Question

Two balls A and B having equal masses and moving along the same straight line with velocities +2 m/s and 5 m/s respectively, collide elastically. If rightwards direction is considered as +ve x axis, then their velocities after the collision will be respectively

A
5 m/s and +2 m/s
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B
3 m/s for both
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C
5 m/s and 1 m/s
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D
None of these
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Solution

The correct option is A 5 m/s and +2 m/s
Before collision,
vA=2 m/s, vB=5 m/s
If masses are equal and collision is elastic, then velocity gets exchanged.

Hence after collision,
vAvB and vBvA
vA=5 m/s and vB=2 m/s
Option (a) is correct.

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