A tractor weighing $21 \mathrm{kN}$ has $70 \%$ static weight on rear axle and its wheel base is $1.8 \mathrm{~m}$. The drawbar hitch is located $25 \mathrm{~cm}$ behind the rear axle centre and $35 \mathrm{~cm}$ above the ground level. To overcome longitudinal instability, the front end loading is provided at a distance of $20 \mathrm{~cm}$ ahead of the front axle centre. It is observed that, there is front-end instability in the tractor due to a pull of $30 \mathrm{kN}$ inclined at $20^{\circ}$ downward from the horizontal. A minimum front-end load required to overcome the instability in $\mathrm{N}$ is________________

A tractor weighing $21 \mathrm{kN}$ has $70 \%$ static weight on rear axle and its wheel base is $1.8 \mathrm{~m}$. The drawbar hitch is located $25 \mathrm{~cm}$ behind the rear axle centre and $35 \mathrm{~cm}$ above the ground level. To overcome longitudinal instability, the front end loading is provided at a distance of $20 \mathrm{~cm}$ ahead of the front axle centre. It is observed that, there is front-end instability in the tractor due to a pull of $30 \mathrm{kN}$ inclined at $20^{\circ}$ downward from the horizontal. A minimum front-end load required to overcome the instability in $\mathrm{N}$ is________________

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