At any instant a rolling wheel can be considered in pure rotation about the instantaneous contact point. The instantaneous rotation axis translates forward at what speed?
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Question

At any instant a rolling wheel can be considered in pure rotation about the instantaneous contact point. The instantaneous rotation axis translates forward at what speed?

G1 Physics · Accepted Answer

Step 1: At each instant the zero-velocity point changes as the wheel advances; the geometric locus of successive contact axes moves with the wheel centre at speed centre-of-mass speed. Step 2: This is the interpretation used for option A in the source. Final answer: A — the centre-of-mass speed.