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Gaokao Physics Practice Question

抗日战争时期, 我军缴获不少敌军武器武装自己, 其中某轻机枪子弹弹头质量约 $8 \mathrm{~g}$, 出膛速度大小约 $750 \mathrm{~m} / \mathrm{s}$ 。某战士在使用该机枪连续射击 1 分钟的过程中, 机枪所受子弹的平均反冲力大小约 $12 \mathrm{~N}$, 则机枪 在这 1 分钟内射出子弹的数量约为

  1. A.40
  2. B.80
  3. C.120
  4. D.160

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