PYQ · UPSC Combined Defence Services 2022 · General Knowledge · Q5 Difficulty 2/5
Physics and Chemistry Fundamentals› Basic Physics: Mechanics, Heat, Light and Waves
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 ?
Answer c.
Explanation Answer · c
The remaining half-lap places the boy one diameter, 200 m, from the start. The time is 225 s, or 225/30=7.5 revolutions at uniform speed. After seven complete rounds and a half-round, the boy is diametrically opposite his start, so displacement magnitude equals the 200 m diameter.
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