(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.
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Total distance = 200 + 200 = 400 km and total time = 3 + 2 = 5 h. Average speed = 400/5 = 80 km/h. Since displacement is zero, average velocity = 0 km/h.
Yes, the ball undergoes straight-line motion along the inclined track. Its motion can be represented by a horizontal line. Since the ball moves in one direction without reversing, total distance and displacement magnitude are equal at A, B, C and ...
Fuel used by a vehicle depends mainly on the total distance travelled, not displacement. Fuel is consumed while the vehicle moves along its actual path. A longer distance generally requires more fuel.
Class 9 Science Exploration Notes for First Term Exam (2026-27). These notes provide chapter-wise concepts, important definitions, formulas, diagrams and exam-focused questions to help students revise effectively and prepare confidently for their first-term examination.