OK, so if gravity is simply the Earth thrusting upwards by some personaly unknown force, then we would be movin at the same velocity. If that is true then why do we fall back to Earth? If we jump and we are moving at the same speed then wouldn't we be going at the current speed of the Earth plus the speed just added by the jump? Or if we were to throw something into the air, then why does it come back if it was already moving at the same speed as the Earth when trown?