A 50-Kg Mass Sits on the Floor of an Elevator in in a Gold

Multiple Choice

A 5.0-kg mass sits on the floor of an elevator in a Gold Coast skyscraper. The elevator has a downward acceleration of 1.0 m/s2. On top of the 5.0-kg mass is an object of unknown mass. The force of the elevator on the 5.0-kg mass is 80 N up. Determine the unknown mass.

A) 3.3 kg
B) 2.4 kg
C) 1.6 kg
D) 4.1 kg
E) 5.0 kg