Actually i took the whole idea from general theory of relativity. ============================================== the fight of two balls can be represented in two dimensions,now we can use the third dimension as space time.they both assumedly advance in X-axis.both the balls will have the same curavture in space time.the earth has caused a curved dimple in nearby space-time.each is following a geodesic.neither of them is experiencing the gravititional force,each is doing what comes naturally,in a curved space. we usually tend to think abou light travelling in straight lines,but general theory of relativity disproves the fact.here's how. ============================================== according to theory of relativity(general)the effect is only due to the fact that light travels a hell lot faster.the flash of light to origin to the landing place of the balls would be so quick thats its path would be indistinguishable from the X-axis itself.the curvature of it in space-time would be same as that of balls.,thus paths of balls and beams of light are geodesics in space time curved by earth.any further clarifications and comments would be welcome. ============================================== bye!