A lead shot of 1 mm diameter falls through a long colummn of glycerine. The variation of the velocity v with distance covered (s) is represented by

Options

A.
B.
C.
D.

Answer

A

Explanation

Initially due to the action of gravity, the lead shot will move with increasing velocity for some time. Then due to the viscosity of the glycerine column, the lead shot will attain a constant terminal velocity. As initially, there is some upthurst on the shot due to glycerine the increase of velocity will not be fully linear. So the variation is shown by plot (a).