Question

Forces 3N, 4N and 12N act at a point In mutually perpendicular direction. The magnitude of the resultant forces is.

Answer 1

R = sqrt(F1_^2 + F_2^2 + F_3^2)
R = sqrt(3^2 + 4^2 + 12^2)
R = sqrt(25 + 144)
R = sqrt(169)
R = 13 N

Magnitude of Resultant force is 13N