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Two particles A, B are moving on two concentric circles of radii R 1 and R 2 with equal angular speed ω . At t = 0, their positions and direction of motion are shown in the figure. : R 2 R 1 B A Y X The relative velocity B A v – v G G at ω π = 2 t is given by :

1. – ω (R 1 + R 2 ) i ˆ
2. ω (R 2 – R 1 ) i ˆ
3. ω (R 1 + R 2 ) i ˆ
4. ω (R 1 – R 1 ) i ˆ

Correct answer: ω (R 2 – R 1 ) i ˆ

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