I need help on the following question:
The direction of force F1 is in a direction west of north with magnitude of 5 newton, and force F2 is unchanged ( which is northeast with a magnitude of 6 newton). If the resultant force F = F1 + F2 now points directly to the north, find the direction of F1 and the resulting F.
My problem is i cannot seem to get the magnitude but i can get the direction:
This is how i got the direction:
When i drew the vectors it was not a right angle triangle so i used this formula:
This is my attempt of finding the magnitude:
using the formula:
F = 5.41N however book's answer says its 6.89N