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R=√f1^2+f2^2+2f1f2 cos a
=√25N^2+9N^2+30N^2. 0,8
=√34+24 N^2
=√58 N^2
R=7,61 N.
Arah,
tg a =f2/f1
=0,6
a=arc tg 0,6
a=30,96 derajat.