A student in an elevator has mass 70 kg and is carrying a 10 kg back pack. Standing on a bathroom scale in the elevator she finds her weight is the same as it usually is without the backpack. What can you say about the motion of the elevator?


A) accelerating downwards at about 1.2 m/s^2

B) accelerating upwards at about 1.2 m/s^2

C) accelerating upwards at about 2.2 m/s^2

D) accelerating downwards at about 2.2 m/s^2

E) Not enough information to tell​