A solid sphere moves at a terminal velocity of 20 m/s in air at a place where g = 9.8 m/s2. The sphere is taken in a gravity free hall having air at the same pressure and pushed down at a speed of 20 m/s.
(a) Its initial acceleration will be 9.8 m/s2 downward.
(b) Its initial acceleration will be 9.8 m/s2 upward.
(c) The magnitude of acceleration will decrease as the time passes.
(d) It will eventually stop.
