A solid sphere moves at a terminal velocity of $10 m/s$ in air at a place where $g = 10 m/s^2$ . The sphere is taken in a gravity free hall having air at the same pressure and pushed down at a speed of $10 m/s$.

  Initially    $mg = 6\pi \eta r\times 10$

   In gravity free space, $mg = 0$, so unbalanced force acts in upward direction. Therefore

                      $a = \frac{mg}{m} =g m/s^2$

Because of upward acceleration, the downward speed decreases and sphere will stop momentarily.