Answer:
- 5 N
Step-by-step explanation:
The bet force is the sum of the all forces are acting on the object and you can see three forces are acting on the box but 2 of them are cancel each other because they have same magnitude but different direction which they are F norm and F grav so if we sum we will have
Fnorm - Fgrav - Ffrict
and the ( -) sign reffers to the lift direction or downward
So you can say the bet force is - 5 N