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  • A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in figure, indicate the one that represents the velocity (v) of the pebble as a function of time (t).

A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plot shown in figure, indicate the one that represents the velocity (v) of the pebble as a function of time (t).

Answers (1)

The answer is the option (c)

When a cylinder is filled with viscous oil and a pebble is dropped from the top, it falls under the effect of gravity and acceleration due to this force. When it enters the oil, a dragging force f = 6 \pi r n v acts opposite, and hence the acceleration of the pebble decreases till it becomes zero and the velocity becomes constant. Hence option c is correct.

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