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The Kerr-Newman metric is used to discuss the averagely measured speed oflight along the radial direction at the black hole from a weak-gravitationreference frame such as an observer on Earth. The velocity equation of light atthe black hole is represented in the spherical coordinate (r, thita, phi) andthe main parameters are the Schwarzschild radius RS, the rotation term a, andthe charged term RQ. From the calculations, the averagely radial speed of lightfrom r=Rs to r= (alpha)Rs with alpha>1 is possibly exceeding the speed of lightc in free space by an observer in a reference frame far away from the blackhole like on Earth. The result extends to the large r region when the rotationof the black hole is very high or the charge is large enough. This averagelyradial speed finally goes to c in a large distance away from the black hole. Wealso propose a new explanation based on our results that the observation of thefaster-than-light particle is due to the light bending near the black hole orsupermassive star with very strong gravity. Finally, we also give explanationthat the propagation speed of gravity shall not be faster than thecorresponding speed of light.

The Averagely Radial Speed of Light for The Rotating And Charged Black Hole