A courier is delivering a 5 kg package to an office high
in a tall building.
The courier uses the elevator to reach the office. While
the elevator (containing the courier who is holding the
package) is accelerating upwards at 0.11 m s−2 what up-
wards force is the courier applying to the package?
The Attempt at a Solution
Ok so i know that the weight force acting on the package is 50N and I know that this will cause a reaction force of 50N upward onto the package.
But im a little confused. Every force has an equal and opposite reaction force right? so the package pushes down on the arm by 50N's and the arm reacts causing an upward force of 50N on the package this is all I get!!
somone please help ive been confused for hours on understanding this i dont just want the answer a physicsbased explanation would help me alot