If average velocity of particle moving on a straight line is zero in a time interval, then

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If average velocity of particle moving on a straight line is zero in a time interval, then

1. Acceleration of particle may be zero2. Velocity of particle must be zero3. Velocity of particle may be never zero in the interval4. Average speed of particle may be zero in the interval

If average velocity of particle moving on a straight line is zero in a time interval, then