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 is A)0 m/s². B)5 m/s². C)10 m/s². D)infinite. E)none of the above

Question

Quizplus · Accepted Answer

When the air resistance equals the weight of the sack, the net force on the sack becomes zero. Therefore, by Newton's second law, the acceleration of the sack becomes zero. This means the sack falls with a constant velocity called the terminal velocity. So, the answer is A) 0 m/s².

A Sack of Potatoes Weighing 200 N Falls from an Airplane.As