Forces physics problems?

1)A box is at rest on a horizontal, frictionless table. Horizontal force F1 points along the positive x-axis; when it is the only force acting on the box, the box accelerates at 3.18 m/s2. Force F2 is also horizontal; it has magnitude 5.94F1 and acts at right angles to the direction of F1.

If forces F1 and F2 act on the box at the same time, find the magnitude of the acceleration of the box now, in m/s2.  

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