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17 July, 06:16

Why does a bullet have more kinetic energy than the recoiling rifle

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Answers (2)
  1. 17 July, 08:02
    0
    When bullet is fired it weights let's say 10 grams (0,01 kg) and has velocity of 1000m/s.

    The rifle which weights 10000 grams (10kg) has velocity 1 m/s.

    The momentum is equal.

    But to calculate kinetic energy you have to use formula

    Lets calculate:

    Bullet's kinetic energy = 1/2*0,01*1000^2 = 5000 J

    Rifle's = 1/2*10*1=5 J

    So the velocity has much larger impact on kinetic energy than mass.
  2. 17 July, 08:24
    0
    They both have the same momentum, not kinetic energy.
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