Wich is the best way to estimate contacttime between racquet and a tennisball, under assumption that the force acting is constant? Also known is the speed of the tennisball after the stroke, v=27.8 m/s (100km/t), and the dimension of the ball under the stroke is half of normal.(adsbygoogle = window.adsbygoogle || []).push({});

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# Estimating contact-time

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