Earth is rotating at constant speed, and everything on it, including me, move along with earth at the same speed. Suppose, I 'jump' from the ground, then the PHYSICAL CONTACT between me and the earth vanishes....... so in such a case, I should not be carried away along with the earth's speed in its direction in the few seconds of time while I am 'flying' in air. So, the ground below my feet should move ahead of me in its speed............I mean to say that, there should be relative motion between me and the ground for the period when I jump from the ground. BUT, this does not happen, I can't find any relative motion between me and the ground. WHY? CAN ANYBODY EXPLAIN THIS AND CLEAR MY DOUBT?