18. A solid sphere moves at a terminal velocity of }20m/s in air at a place where }g=9.8m/s^2 . The } sphere is taken in a gravity free hall having air at the same pressure and pushed down at a } speed of }20m/s. (A) Its initial acceleration will be }9.8m/s^2 downward } (B) Its initial acceleration will be }9.8m/s^2 upward} (C) The magnitude of acceleration will decrease as the time passes. } (D)It will eventually stop.

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Q. A solid sphere moves at a terminal velocity of 20 m s⁻¹ in air at a place where g = 9.8 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 20 m s⁻¹.
(a) Its initial acceleration will be 9.8 m s⁻² downward.
(b) It initial acceleration will be 9.8 m s⁻² upward.
(c) The magnitude of acceleration will decrease as the time passes.
(d) It will eventually stop

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20 {ms}^{- 1}

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g = 9.8 {ms}^{- 2}

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20 {ms}^{- 1}

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