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=
=
= N
= 10 N
F2 = 6N
α=90
R=?
R = √F1²+F2²-2F1 F2 cosα
R = √8²+6²- 2x6xcos 90
R = √8²+6²- 2x6x0
R = √ 64+36
R=√100 = 10N