A 20.0-kg package is dropped from a high tower in still air and is "tracked" by a radar system. When the package is 25 m above the ground, the radar tracking indicates that its acceleration is 7.0 m/s². Determine the force of air resistance on the package. A)56 N B)28 N C)280 N D)196 N E)140 N

Question

Quizplus · Accepted Answer

The net force on the package is the gravitational force minus the air resistance. The gravitational force is 20.0 kg * 9.8 m/s² = 196 N. The net force is 20.0 kg * 7.0 m/s² = 140 N. Therefore, the air resistance is 196 N - 140 N = 56 N.

A 200-Kg Package Is Dropped from a High Tower in Still