Assertion: cue ball's speed | /r/HasProperty | about 4 meters per millisecond
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Source sentences:
text: The speed of sound in maple is about 4 meters per millisecond, and therefore the time it takes for the ball to even begin to know about the back of the cue (disturbance travels two stick lengths, about 3m) is about 0.75ms–the contact time with a phenolic tip.