Posted by **Preston** on Tuesday, February 5, 2013 at 3:19pm.

A particle undergoes three displacements.

The first has a magnitude of 15 m and makes an angle of 30 degrees with the positive x axis. The second has a magnitude of 8.6 m and makes an angle of 149 degrees with the positive x axis. After the third displacement the particle returns to its initial position.

Find the magnitude of the third displacement.

Answer in units of m

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