Please help with the following Vector Questions

VECTORS 1. Find the resultant of two vectors of 40 N and 25 N having an angle of 60" between them. [4] 2. What is the resultant of two forced of 30 N and 20 N having an angle of 90" between them? [4] 3. Find the resultant of two vectors of 100 N and 150 N having an angle of 120" between them. [4] 4. Two forces of 35 N and 15 N act at an angle of 50" at one point on a body. What single force can replace these two forces and produce the same effect? [5] 5. Resolve a force of 100 N, acting at 30" to the positive x-axis, into its horizontal and vertical components. [2] 6. Resolve a force of 250 N, acting at 120" to the positive x-axis, into its horizontal and vertical components. [2] 7. Resolve a force of 200 N, acting at 245" to the positive x-axis, into its horizontal and vertical components. [2] 8. What is the angle between two forces of 50 N and 30 N whose resultant is 60 N? [ 4]9. Find the resultant of the forces: 4 N, 8 N, 10 N and 6 N acting in the directions shown in the figure below. [6] 6 N 4N+ - 30%. 10 N 8 N 10. A weight of 200 N, suspended by a cord, is pulled aside through 35" from the vertical by a horizontal force F. (i) Use the polygon method to find the magnitude of the force F. (ii) Use the component method to check your answer to (i) above. [7] 11. A car travelling North at 12 m s" changes direction so that it is finally travelling East at 12 m s . Find its change in velocity. [5]