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At the Wimbledon Grand Slam Tournament matches, tennis balls are changed (replaced with new ones) every seven and nine games alternatively. Why?<\/p>\n","answers":["

Because the ball gets worn out due to the friction caused by heavy hitting by racquets and the bounce off the ground<\/p>\n","

Because the ball loses its sheen and the brand logos are not clearly visible on the television cameras<\/p>\n","

Because the ball becomes colour faded and blends with the background<\/p>\n","

Because it is a tradition stipulated by the Queen of England<\/p>\n"]}],"overallFeedback":[{"from":0,"to":100}],"behaviour":{"autoContinue":true,"timeoutCorrect":2000,"timeoutWrong":3000,"soundEffectsEnabled":false,"enableRetry":true,"enableSolutionsButton":false,"passPercentage":100},"l10n":{"nextButtonLabel":"Next question","showSolutionButtonLabel":"Show solution","retryButtonLabel":"Retry","solutionViewTitle":"Solution list","correctText":"Correct!","incorrectText":"Incorrect!","muteButtonLabel":"Mute feedback sound","closeButtonLabel":"Close","slideOfTotal":"Slide :num of :total","scoreBarLabel":"You got :num out of :total points"}},"library":"H5P.SingleChoiceSet 1.11","metadata":{"contentType":"Single Choice Set","license":"U","title":"Physics and Wimbledon"},"subContentId":"3513d2cf-cbe7-4a11-a242-82bc0b1f6ed1"}],"disableBackwardsNavigation":false,"randomQuestions":false,"endGame":{"showResultPage":true,"showSolutionButton":true,"showRetryButton":true,"noResultMessage":"Finished","message":"Your result:","overallFeedback":[{"from":0,"to":100}],"solutionButtonText":"Show solution","retryButtonText":"Retry","finishButtonText":"Finish","showAnimations":false,"skippable":false,"skipButtonText":"Skip video"},"texts":{"prevButton":"Previous question","nextButton":"Next question","finishButton":"Finish","textualProgress":"Question: @current of @total questions","jumpToQuestion":"Question %d of %total","questionLabel":"Question","readSpeakerProgress":"Question @current of @total","unansweredText":"Unanswered","answeredText":"Answered","currentQuestionText":"Current question"},"override":{"checkButton":true,"showSolutionButton":"off"}},"library":"H5P.QuestionSet 1.16","metadata":{"contentType":"Question Set","license":"U","title":"Physics and Wimbledon"},"subContentId":"26fd4780-91d8-4966-b733-0aef9af88711"},"useSeparator":"auto"}]}

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Physics and Wimbledon

Physics and Wimbledon

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