A spherical ball is dropped in a long column of a highly viscous liquid. The curve in the graph shown, which represents the speed of the ball $(v)$ as a function of time $(t)$ is 
NEET 2022, Easy
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Initially speed is zero, then increases \& after some time it becomes constant.

 

Acceleration (slope of $v / t$ curve) of ball first decreases and after some time it becomes zero.

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