A $8000\mathit{ kg}$ engine pulls a train of $5$ wagons, each of $2000\mathit{ kg}$, along a horizontal track. If the engine exerts a force of $40000\mathit{ N}$ and the track offers a friction force of  $5000\mathit{ N}$, then the net accelerating force is _______ $N$ and the acceleration of the train is ________$m/s^2$.

The net accelerating force is 35000 N and acceleration of the train is 1.94m/s²
Given:
Force applied by the engine = $40,000\mathit{ N}$
Friction force in the direction opposite to the motion = 5,000 N
The net force, $\mathit{F }= 40,000\mathit{ N }- 5,000\mathit{ N}$
                               $= 35,000\mathit{ N}$
Mass of the train,      $\mathit{m }= 5 \times 2,000\mathit{ kg }+ 8,000\mathit{ kg }$            $= 18000\mathit{ kg}$
From Newton's second law of motion, acceleration,
$\mathit{a }= \frac{F}{m}$ $\Rightarrow$ $\frac{35000\mathit{ N}}{18000\mathit{ kg}}$ $\Rightarrow$ 1.94 m/s²
Acceleration of the train is $1.94\mathit{ m}/s$²