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If a body A is moving with a constant velocity v and an observer on that body A observes another body B to be at rest then the kinetic energy of B is zero. So is energy dependent on the frame of reference if so then how is the conservation of energy stated?

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    $\begingroup$ Basically work energy theorem as well as mechanical energy conservation law is depends on the reference frame.If you refer any standard book on mechanics then the term v^2 in kinetic energy is equation is ( v_{particle,frame}). $\endgroup$
    – user213933
    Commented Mar 20, 2019 at 9:57

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Energy is conserved in each inertial frame.

EDIT: As every inertial frame is equally plausible, there is no absolute velocity and therefore no absolute kinetic energy.

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    $\begingroup$ So if we happen to change our frame of reference we need to recalculate our energies right? $\endgroup$ Commented Mar 20, 2019 at 9:41
  • $\begingroup$ @durgaprasadpaidi Yes, I modified my answer. $\endgroup$
    – paleonix
    Commented Mar 20, 2019 at 9:55

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