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Von Venus Williams geschlagen...


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... aber nur knapp!

Habe gestern mal mit Tennisbällen geschossen, 207 km/h! Gerade mal 2 km/h langsamer als Venus Williams in ihrem Rekord-Aufschlag.

Tennisbälle sind schwer, 58 Gramm - das sind dann immerhin 96 Joule Leistung.


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