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Practice #14,564
Q
उच्च द्रव्यमान वाले एक टेनिस बॉल व एक क्रिकेट गेंद को समान वेग से फेंका जाता है तो क्रिकेट गेंद को रोकने के लिए हमें निम्नाकिंत में से किसकी आवश्कता होगी ?
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