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.