Forces ${F_1}$ and ${F_2}$ act on a point mass in two mutually perpendicular directions. The resultant force on the point mass will be
- A${F_1} + {F_2}$
- B${F_1} - {F_2}$
- C$\sqrt {F_1^2 + F_2^2} $
- D$F_1^2 + F_2^2$
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