A particle moving along x-axis has acceleration f, at time t, given by f = f 0 (1 - t T ) , where f 0 and T are constants. The particle at t = 0 has zero velocity. In the time interval between t = 0 and the instant when f = 0 , the particle's velocity (v x) is

1. A. 1 2 f 0T 2
2. B. f 0T 2
3. C. 1 2 f 0T
4. D. f 0T .

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