A two-wheel drive tractor weighing $18 \mathrm{kN}$ has a wheel base $1.8 \mathrm{~m}$. Its centre of gravity is located $600 \mathrm{~mm}$ ahead of the rear axle centre, under static condition, on a level ground. When this tractor is used to pull a disc plough hitched at a height of $390 \mathrm{~mm}$ from the ground, the draft observed is $6 \mathrm{kN}$. The change in reaction on rear wheels of the tractor due to pull in $\mathrm{kN}$ is
(A) 1.30
(B) 1.95
(C) 3.90
(D) 5.85
A two-wheel drive tractor weighing $18 \mathrm{kN}$ has a wheel base $1.8 \mathrm{~m}$. Its centre of gravity is located $600 \mathrm{~mm}$ ahead of the rear axle centre, under static condition, on a level ground. When this tractor is used to pull a disc plough hitched at a height of $390 \mathrm{~mm}$ from the ground, the draft observed is $6 \mathrm{kN}$. The change in reaction on rear wheels of the tractor due to pull in $\mathrm{kN}$ is
(A) 1.30
(B) 1.95
(C) 3.90
(D) 5.85