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Three people are pulling a heavy object along the floor with forces A, B and C as
shown in the figure. What is the resultant (i.e. suml of the three forces? The forces are
given by (all angles are CCW from + x-axis):
A = magnitude 20 N, direction 30º.
B = magnitude 40 N, direction 140°.
C= magnitude 30 N, direction 240º.
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