question_answer 44)

                  An object falling through a fluid is observed to have acceleration given by \[a=g-b\upsilon \] where g = gravitational acceleration and b is constant. After a long time of release, it is observed to fall with constant speed. What must be the value of constant speed?                

Answer:

                  When object falls with constant speed, then its velocity is also constant.                 Hence \[a=0\]                 \ \[g-b\,\,\upsilon =0\]                 or   \[\upsilon =g/b\]