A solid sphere moves at a terminal velocity of `20ms^-1` in air at a place where `g=9.8ms^-2`. The sphere is taken in a gravity free hall having air at the same pressure and pushed down at a speed of `20 ms^-1`

Options

A. its initial acceleration will be `9.8ms^(-2)` downward.
B. its initial acceleration will be `9.8ms^(-2)` upward
C. The magnitude of acceleration will decrease as the time passes.
D. it will eventually stop.

Answer

B, C, D

Explanation

`v_(t)=(2r^(2)rhog)/(9eta)`