2022 · Q5
A boy completes one round of a circular track of diameter 200 m in 30 s. What will be the displacement at the end of 3 minutes and 45 seconds?
General KnowledgePhysics
- A50 m
- B100 m
- C200 m
- D236 m
Explanation
3 minutes 45 seconds = 225 s, and one round takes 30 s, so the boy completes 225/30 = 7.5 rounds. After 7 full rounds he is back at the starting point; the extra half-round leaves him diametrically opposite. Displacement is the shortest distance between start and end points, which is the diameter: 200 m.