Posted by **sarah** on Tuesday, January 8, 2013 at 11:17pm.

Three forces with magnitudxes 100, 50 and 80 lbs act on an object at angles of 50 degree, 160 degree and -20 degree respectively.

- pre-cal -
**Steve**, Wednesday, January 9, 2013 at 10:36am
I assume you want the resultant force? Just convert the polar coordinates to rectangular, add them, and convert back to polar:

(100,50°) = (64.28,76.60)

(50,160°) = (-46.98,17.10)

(80,-20°) = (75.18,-27.36)

add them to get

(92.48,66.34) = (113.81,35.65°)

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