Using a Motion Sensor,Sean Finds That the Acceleration of a 2-Kg

Multiple Choice

Using a motion sensor,Sean finds that the acceleration of a 2-kg rock that has been dropped from the roof of a building is 5.5 m/s².He concludes that the magnitude of force of air resistance acting on the rock is approximately

A) 19.6 N
B) 11.0 N
C) 9.81 N
D) 6.62 N
E) None of these is correct.