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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. |
| Answer» 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. | |