Question

Which of the following statements are incorrect?
(i) Average velocity is path length divided by time interval.
(ii) In general, average speed is greater than the magnitude of the average velocity.
(iii) A particle moving in a given direction with a non-zero velocity can have zero speed.
(iv) The magnitude of average velocity is the average speed.

• A. (ii) and (iii)
• B. (ii) and (iv)
• C. (i), (iii) and (iv)
• D. All four

Answer 1

The correct option is C (i), (iii) and (iv)

Average velocity = $\frac{Displacement}{Timeinterval}$
A particle moving in a given direction with non-zero velocity cannot have zero speed.
In general, average speed is not equal to magnitude of average velocity. However it can be so if the motion is along a straight line without change in direction.