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a) Uniform motion
b) Runner A is moving with constant velocity. For runner B, velocity is increasing with time (uniformly accelerated). Hence runner B will win the race.
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a) Uniform motion
Since the displacement-time graph is a straight line, it means that the velocity is constant. So, A has uniform motion.
b) B will win the race (assuming time is sufficient).
Although A has greater velocity (greater slope), B has acceleration (the velocity is increasing in the velocity-time graph). So, if the time is enough, at a particular point, B's velocity will be much higher than that of A, that he will overtake A easily.
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