Question

Question #05d2d

Answer 1

Option C. subtracted.

Explanation:

As the two forces are in opposite direction, they will get subtracted.
Forces in the same direction are added.

Answer 2

See below.

Explanation:

The force resultant `vec R` is the sum of all acting body forces. So `vec R = vec N + vec W`. Forces are vector objects so they add according to the vector addition rules. In the present case, calling `hat i, hat j` the reference unit vectors, we have

`vec N = 0 hat i + N hat j`
`vec W=0 hat i - W hat j`

so

`vec R = 0 hat i +(N-W) hat j`