The possible resultant of two forces 40 Newton and 10 Newton

Just use 40 as a and 10 as b

R=a2+b2+2abcos0−−−−−−−−−−−−−−√ (cos0=1)

⟹R=(use root)asquare+bsquare+2ab

⟹R=(use root)(a+b)square−−−−−−√

⟹R=(use root)(a+b)12×2

⟹R=(use root)a+b

Or,R=30+40=70 N

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