Question

A boy completes one round of a circle of radius R in 20s . The ratio of magnitude of displacement to distance after 10s.

I kindly request ace or expert to do it not to hurt other but I believe they will answer it correctly .

GOOD LUCK

Answer 1

Hi dear friend,

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I may not be an ace or an expert on brainly.in but surely I know physics well enough to answer your question.

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According to the question .....

Imagine a circular path ( a big one.... ) and a boy moving in that path...

to complete a full circle he takes 20 seconds but for 10s he completes only half a circle..

Distance: is the total path length traversed by the boy

Displacement: is the length of the straight line joining initial and final positions of the boy

take distance as 'D' and displacement as 'S' ...

In 10 seconds

we calculate distance as the total path length traversed by the boy(i.e half the circumference = $\pi$ x R)

we then calculate Displacement as the length of the straight line joining initial and final positions of the boy

(i.e, the diameter S = 2R)

When we take ratio of D and S,

we obtain ratio as $\frac{D}{S} = \frac{\pi }{2}$ [Ans.]

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Cheers : )