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Concerning acceleration value you have asked, given numbers are totally viable.
Please see the following links for more information:
* http://www.golf-simulators.com/physics.htm for contact time
* http://hypertextbook.com/facts/2006/BishoyEmmanuel.shtml and http://www.berkeleyhallclub.com/pdfs/golftip.pdf for a ball speed
Thank you very much for the answer. However I was confused that how the acceleration of a object be so great. The acceleration of the ball in 0.0005 seconds is 140km per hour. That kind of acceleration wouldn't be possible by human force, should it??