An object is moving in a circle of radius $100 m$ with a constant speed of $31.4 m / s$ . What is its average speed for one complete revolution?

Z e r o

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31.4 m / s

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3.14 m / s

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\sqrt{2} \times 31.4 m / s

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Solution

The correct option is B $31.4 m / s$
Given,
$r = 100 m$
$v = 31.4 m / s$
Circumference $= 2 π r$
Average speed, $v_{a v g} = \frac{T o t a l d i s t a n c e c o v e r e d}{T o t a l t i m e}$
$v_{a v g} = \frac{2 π r}{2 π r / v} = v$
$v_{a v g} = 31.4 m / s$
The correct option is B.

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