A bullet of mass m moves with speed v and hits a platform with sand moving with speed u in the same direction and gets stuck in it. In the reference frame associated with the Earth, the change in the kinetic energy of the bullet is equal to: ΔEk1=mu2/2 - mv2/2=m/2•(u2-v2) and in the reference frame associated with the platform, ΔEk2=-m/2•( vu)2 Considering that the amount of heat released during the collision is equal to the change in kinetic energy Q=-ΔEk, we obtain a paradoxical result that contradicts the principle of relativity: as if it is possible that in one frame of reference the bullet will melt, but in another it will not melt. Explain this paradox.
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