A cyclist moving on a circular track of radius \( 40 \mathrm{~m} \) completes half a revolution ...

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A cyclist moving on a circular track of radius \( 40 \mathrm{~m} \) completes half a revolution in \( 40 \mathrm{~s} \). Its average velocity is
(a) zero
(b) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn4/mnmiπ/mimo mathvariant=italic /momsupmims/mimrowmo-/momn1/mn/mrow/msup/math
(c) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn2/mnmo /momi mathvariant=normalm/mimsupmrowmo /momi mathvariant=normals/mi/mrowmrowmo-/momn1/mn/mrow/msup/math
(d) math xmlns=http://www.w3.org/1998/Math/MathML class=wrs_chemistrymn8/mnmiπ/mimo mathvariant=italic /momsupmims/mimrowmo-/momn1/mn/mrow/msup/math
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