A force of 90 lb acts on an object at an angle of 55 degrees.  A second force of 100 lbs acts on the object at an angle of -60 degrees. Find the direction and magnitude of the resultant force.  

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First force is not measured in pounds but in newtons so I will pretend the forces are 90 N and 100 N.

Now we can calculate the magnitude of resultant force by using law of cosine (see the image below).

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