A tractor pulls $8 \mathrm{kN}$ drawbar load against $4 \mathrm{kN}$ rolling resistance. If the tractor develops $57 \%$ tractive efficiency, the slip experienced by the tractor in percentage will be___________
A tractor pulls $8 \mathrm{kN}$ drawbar load against $4 \mathrm{kN}$ rolling resistance. If the tractor develops $57 \%$ tractive efficiency, the slip experienced by the tractor in percentage will be___________