CMB energy

Jarek Rzepecki jarekr w
Śro, 25 Lut 2004, 09:57:41 CET

> When you throw a frictionless ball up in the air at initial vertical
> velocity  v_0,  it starts off with kinetic energy  0.5 m v_0^2 .
> So why does the ball lose (kinetic) energy as it goes up? Why does
> 0.5 m v^2 get smaller? Where does the energy go?

 Well, sure but how can one definne potential energy for a photon?

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