Answer
$1000N$
Work Step by Step
We call the tension $T$
The board has a mass of 50 kg, and it makes an angle $\theta=30^{\circ}$ with the horizontal axis.
So, the force due to gravity is: $50\times10=500N$
Thus:
$T\sin30^{\circ}=500N$
$T=1000N$
