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Yoass is correct assuming the ball doesn't deform.
But the patterns on tangentional impact are not circles.So? If the mark is narrower then the ball didn't penetrate as deeply.
I understand. It is an estimate. basically, the ball causes the top sheet to deform in the area close to the impact.Whats more - the stamp on the ball will be different than the stamp on the recovered rubber surface, but same /or closer/ to the rubber surface deformation pattern during the impact.
Observing the stamp pattern on the rubber surface after its recovering can tell somethings, but not what I ment.
I'm sorry if the abstraction of the concept is not clear.