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A wheel rolls without slipping with the centre of mass having velocity v. The instantaneous velocity of the point of contact with the ground is:
Av
BZero
C2v
Dv / 2
Answer & Solution
Correct answer: B. Zero
1. Pure rolling means no slipping at the contact point.
2. Velocity of contact point = v_cm + ω × r_contact = v + (−v) = 0.
3. Friction at the contact point does no work because the contact point is momentarily at rest.
4. The TOP of the wheel moves at 2v (sum of v_cm and ωR).
_Source: NCERT Class 11 Physics Ch 6 §6.13 Rolling Motion_
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