$5$

Formula $2$ points

The worker exerts a force as shown in the diagram, which results in the $42$ kg crate moving away from its present position shown in the diagram, to its new position where it is directly above the trailer. In this new position, calculate the magnitude of the tension $T$ in the cable $AB($in Newtons$).($take $g=9\mathrm{.}81ms-2).$