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 squared is
A)0)
B)5)
C)10.
D)infinite.
E)none of the above

Question

Quizplus · Accepted Answer

When air resistance equals the weight of the sack (200 N), the net force acting on the sack is zero. According to Newton's second law (F = ma), if the net force is zero, the acceleration is also zero.

A Sack of Potatoes Weighing 200 N Falls from an Airplane