This paper discusses the escape velocity for a limited material distribution in a gravity field. This requeres examining the Newton’s law of gravitation , the gravitational field vector of a limited material distribution in a specific point and potential function togother with the potential energy. In paper, have proved that potential energy vanished in infinity . This requires also examining Hamilton’s function then we have found the escape velocity of a material point from a sphere’s surface ,when the motion of the material point is vertical , horizontal or oblique . We found the escape velocity for a material point from a disk in the vertical and oblique cases. In paper, we also find out the escape velocity from a ring in both vertical and oblique cases . It is appeared that the escape velocity from the ring identifies with that we get from the sphere case.