Question

1. what is the resultant force? a) none of the above b) 11n, left c) 17 n, left d) 6n, right 19. what is the net force? a) 5.5 n right b) 5.5 n left c) 2.5 n left d) 2.5 n right

Explanation:

Step1: Define left - direction as negative and right - direction as positive for 18th question

The forces acting on the block are $F_1=- 12N$ (left - acting 12N force), $F_2=-5N$ (left - acting 5N force) and $F_3 = 6N$ (right - acting 6N force).

Step2: Calculate the resultant force for 18th question

The resultant force $F_{resultant}=F_1 + F_2+F_3=-12 - 5+6=-11N$. The negative sign indicates the direction is to the left. So the resultant force is 11N to the left.

Step3: Define directions for 19th question

Let the right - direction be positive and the left - direction be negative. The forces acting on the car are $F_4 = 4.0N$ (right - acting) and $F_5=-1.5N$ (left - acting).

Step4: Calculate the net force for 19th question

The net force $F_{net}=F_4+F_5=4.0+( - 1.5)=2.5N$. The positive sign indicates the direction is to the right.

Answer:

1. b) 11N, Left
2. d) 2.5N right