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15 kg द्रव्यमान का एक गोला `4" m"//"s"` के एकसमान वेग से गतिशील है | गोले की गतिज ऊर्जा कितनी होगी ?

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दिया गया है कि
गोले का द्रव्यमान `m=15" kg"`,
गोले का वेग `v=4" m"//"s"`.
सूत्र `E_(k)=(1)/(2)"mv"^(2)` से,
`E_(k)=(1)/(2)xx15" kg"xx(4" m"//"s")^(2)`
`=120" kg m"^(2)//"s"^(2)=120" J"`.
अत: , गोले की गतिज ऊर्जा 120 J होगी |

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