1. Contact between putter and ball

For a 10 foot putt the clubhead approaches the ball at a speed of approximately 3-4 mph (depending on the green speed).

Impact will last for a little more than 1/2 of 1 millisecond (0.0005 seconds). The energy transfer from the clubhead to the ball is more efficient with a putter than any other club in the bag and approaches (or exceeds) a COR of 0.9

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