Question

Ques 6 Vectors , physics-11

Answer 1

F1=3N and F2=4N

${r}^{2} = {f1}^{2} + {f2}^{2} + 2 \times f1 \times f2 \times \cos(?)$
I) let r=1N
${1}^{2} = {3}^{2} + {4}^{2} + 2 \times 3 \times 4 \times \cos(?)$
$1 = 25 + 24 \cos(?)$
$24 \cos(?) = 1 - 25$
$\cos(?) = - 24 \div 24$
$\cos(?) = - 1$
$\cos(?) = 180$