\(\)\(ΣFX=0\)
\(TBX-TDX=0\)
\(TB Cos 30-TD=0\)
\(ΣFY=0\)
\(TBY-TA=0\)
\(TB Sen 30\)
\((40)(9.81)Sen30-\vec{w\ }=0\)
\((40)(9.81)Sen30=m\left(9.81\right)\)
\(40\ Sen30=ma\)
\(m=40\ Sen30\)
\(m=20kg\)