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[tex]\boxed{\sf \tau=rFsin\theta}[/tex]
Put values
[tex]\\ \rm\hookrightarrow 40=2Fsin40[/tex]
[tex]\\ \rm\hookrightarrow Fsin40=20[/tex]
[tex]\\ \rm\hookrightarrow 0.64F=20[/tex]
[tex]\\ \rm\hookrightarrow F=31.25N[/tex]