question_answer 32)

                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 Fig. Indicate the one that represents the velocity \[(\upsilon )\] of the pebble as a function of time (t). (a)          (b)                 (c)          (d)                

Answer:

                (c) After some time, pebble acquires terminal velocity (i.e. constant velocity) which it falls through a viscous oil.