Here is how to solve this. Decide on a direction for each vector. Use your scientific calculator to do a polar-to-rectangular conversion - i.e., separate each vector in horizontal and vertical components. (Check your calculator's manual on how to carry out a polar-to-rectangular conversion.) Add the vectors by components. Finally, convert back to polar (rectangular-to-polar conversion, on your scientific calculator).
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200 + n = 100 + 200200 + n = 300n = 300 - 200n = 100
F = M AM = F/A = 200/5 = 40 kg
One scale is reading 200N and the other is reading 400N.
400 N 400 N / 10cm2 = 2000 N / 50cm2