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For a body **rolling without slipping** on a flat surface with centre-of-mass velocity $v$, the **velocity of the topmost point** is:
A$0$
B$v$
C$2v$
D$v/2$
Answer & Solution
Correct answer: C. $2v$
Rolling: $v_{\text{cm}} = R\omega$. Top point: $v_{\text{cm}} + R\omega = 2v$. Bottom (contact) point: $v_{\text{cm}} - R\omega = 0$ (instantaneously at rest).
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