COMPARING D-BRANES TO BLACK-BRANES

We calculate the potential between two different stationary D-branes a nd the velocity dependent potential between two different moving D-bra nes. We identify configurations with some unbroken supersymmetry, usin g a zero force condition. The potentials are compared with an eleven d imensional calculation of the scattering of a zero black-brane from th e 0, 2, 4 and 6 black-brane of type IIA supergravity. The agreement of these calculations provide further evidence for the D-brane descripti on of black-branes, and for the eleven dimensional origin of type IIA string theory.