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यदि दो कण 1kg ,2kg एक - दूसरे की ओर 5 मीटर / सेकण्ड की चाल से गतिमान हो तो इनके द्रव्यमान केन्द्र का वेग क्या होगा ?

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`v_(CM) = (m_(1) v_(1) + m_(2) v_(2))/(m_(1) + m_(2))`
`(1(5) + 2(-5))/(1 + 2) = (-5)/(3) ` मीटर / सेकण्ड अर्थात 5 /3 मीटर / सेकण्ड , 2 किग्रा के पिण्ड की गति की दिशा में

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