A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate :
the net accelerating force :

Explanation

Here, Mass of the engine, M = 8000 kg
Mass of each wagon = 2000 kg
`therefore` Total mass of all the 5 wagons,
m = `2000xx5` kg
= 10000 kg
Force exerted by the engine, F = 40000 N
Friction offered by the track, f. = 5000 N
Net accelerating force = F-F.
(40000 - 5000) N
= 35000 N