(i) Average velocity equals average speed when the object moves in a straight line without changing direction.
(ii) Average velocity is zero when the object returns to its starting point, although it has travelled a non-zero distance.
Under what condition(s) is the: (i) magnitude of average velocity of an object equal to its average speed? (ii) magnitude of average velocity of an object zero while its average speed is not zero?
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(i) The magnitude of average velocity is equal to average speed when an object travels along a straight-line path without changing its direction, so distance travelled equals the magnitude of displacement.
(ii) The magnitude of average velocity can be zero when the object returns to its starting point. Its displacement is then zero, but its total distance travelled is not zero, so its average speed remains non-zero.
For more NCERT Solutions of Class 9 Science Exploration Chapter 4 Describing Motion Around Us Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-4/