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Physics-

General

Easy

Question

An object is moving in a circle of radius 100 m with a constant speed of $31.4 blank m s to the power of negative 1 end exponent$ . What is its average speed for one complete revolution?

Zero
$31.4 {m s}^{- 1}$
$3.14 {m s}^{- 1}$
$\sqrt{2} \times 31.4 {m s}^{- 1}$

The correct answer is: $31.4 blank m s to the power of negative 1 end exponent$

The time taken by the particle for one complete revolution.
$t equals fraction numerator 2 pi r over denominator s p e e d end fraction$
$equals fraction numerator 2 cross times 3.14 cross times 100 over denominator 31.4 end fraction equals 20 s$
$H e n c e comma blank a v e r g e blank s p e e d blank i s blank$
$v subscript a v end subscript equals fraction numerator 2 cross times 3.14 cross times 100 over denominator 20 end fraction equals 31.4 blank m s to the power of negative 1 end exponent$

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