A) 7 N
B) 1 N
C) 5 N
D) zero
Correct Answer: C
Solution :
Resultant force, \[F=\sqrt{F_{1}^{2}+F_{2}^{2}+2{{F}_{1}}{{F}_{2}}\cos \theta }\] \[=\sqrt{{{(3)}^{2}}+{{(4)}^{2}}+2\times 3\times 4\cos {{90}^{o}}}\] \[=5N\]
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