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A particle is moving with speed v = x b along positive x-axis. Calculate the speed of the particle at time t = τ (assume that the particle is at origin t = 0)

1. 2 b 2 τ
2. b 2 τ
3. 2 b 2 τ
4. 4 b 2 τ

Correct answer: 2 b 2 τ

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