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In page Joule:

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One joule represents (approximately):

  • The typical energy released as heat by a person at rest every 1/60 s (17 ms).[note 1][citation needed]
  • The kinetic energy of a 50 kg human moving very slowly (0.2 m/s or 0.72 km/h).[citation needed]
  • The kinetic energy of a 56 g tennis ball moving at 6 m/s (22 km/h).[2]