A Sack of Potatoes Weighing 200 N Falls from an Airplane

Multiple Choice

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is

A) 0.
B) 9.8.
C) 4.9.
D) infinite.
E) none of these