As photons reach a black hole and begin fall in - is their speed increased as they go down (like a vacuum cleaner does to dust).
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3$\begingroup$ Possible duplicates: physics.stackexchange.com/q/24319/2451 , physics.stackexchange.com/q/98980/2451 , and links therein. $\endgroup$ – Qmechanic♦ Apr 2 '14 at 20:29
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$\begingroup$ Also, photons travel at the speed of light, thus their speeds cannot increase. $\endgroup$ – Kyle Kanos Apr 3 '14 at 0:52
