Which of the following statement is correct? (a) The magnitude of average velocity is the averag...

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Which of the following statement is correct?
(a) The magnitude of average velocity is the average speed.
(b) Average velocity is the displacement divided by time interval.
(c) When acceleration of particle is constant, then motion is called as non-uniformly accelerated motion.
(d) When a particle returns to its starting point its displacement is not zero.
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