Lin suffers from pain in her right wrist. Several doctors check her wrist regularly over a period of time. Doctors' notes and MRI results confirm that Lin has carpal tunnel syndrome. Her successful diagnosis is made as a result of..?
A-labor laws.
B-practitioner fatigue.
C-negligence.
D- direct observations.

D

Explanation:

They looked at her hand and made a formal conclusion from that

explanation:

the masses of the objects and the distance between them

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.