When a ball is thrown up straight overhead. It just follows the curved space with the speed it is being released and seems as if the ball gradually slows down to zero at the top most and return to earth. If I'm right, according to Newtonian physics, the ball speed is zero at the top. And according to Einstein physics, the ball speed doesn't slows at all, it travel with the same speed it is being released. So if an object is placed at the top most height the ball achieve. What impact the object would have with the ball at the top most, with zero speed or the speed it is being released.