Using a Motion Sensor,Susana Finds That the Acceleration of a 4-Kg

Multiple Choice

Using a motion sensor,Susana finds that the acceleration of a 4-kg rock that has been dropped from the roof of a building is 6 m/s².She concludes that the magnitude of force of air resistance acting on the rock is approximately

A) 39.2 N
B) 24.0 N
C) 15.2 N
D) 9.81 N
E) None of these is correct.