A circular hoop rolls without slipping on a flat horizontal surface. Which one o

Question

A circular hoop rolls without slipping on a flat horizontal surface. Which one of the following is necessarily true?

A) All points on the rim of the hoop have the same velocity.
B) All points on the rim of the hoop have zero acceleration.
C) All points on the rim of the hoop have the same speed.
D) All points on the rim of the hoop have acceleration vectors that point toward the center of the hoop.
E) All points on the rim of the hoop have acceleration vectors that are tangent to the hoop.
I just took a test with this question, I couldn't decied between C and D. I ended up picking C, which one is right?

Explanation / Answer

A) All points on the rim of the hoop have the same velocity.

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