A 1000 kg engine pulls a train of 4 wagons each of 2500 kg along a horizontal railway track. If the engine exerts a force of 50000 N on wagons and track offers force of friction 10000 N, then calculate
(i) The net accelerating force
(ii) The acceleration of the train
(iii) The force of wagon-1 on wagon-2

Explanation

Let's solve the problem step by step.

### Given Data:
- Mass of the engine, \( m_e = 1000 \, \text{kg} \)
- Mass of each wagon, \( m_w = 2500 \, \text{kg} \)
- Number of wagons, \( n = 4 \)
- Force exerted by the engine, \( F_{\text{engine}} = 50000 \, \text{N} \)
- Force of friction, \( F_{\text{friction}} = 10000 \, \text{N} \)
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