If three forces F1, F2 and F3 act on one point, the magnitude of which is 10N, 20n and 20n respectively, and form an angle of 120 degrees with each other, the resultant force is This is a double-choice question: a.0n b.10n c.20n d.30n. I only got a 10N, but I can't think of a second solution,

The resultant force of two 20n forces with an included angle of 120 degrees is still 20n. The diagonal line is on the bisector of the two forces and forms an equilateral triangle. It is on the same straight line and reverses the 10N force. Therefore, the resultant force of the three forces is 10N
If there are two answers, there should be one solution when the three forces are not coplanar

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