Question

A 8000kg engine pulls a train of 5 wagons each of mass 2000 kg . If the engine exerts a force of 40000N and track offers a friction force of 5000N calculate
the acceleration ​

Answer 1

Mass of Engine= 8000kg

No. of wagons=5

Mass of each wagon=2000kg

Force exerted by engine= 40000N

Friction Force=5000N

Acceleration= Force exerted by engine- Friction Force

= 40000-5000

=35000N

Answer 2

Answer:

total mass of train with wagons= 8000kg+ 5×2000kg

= 8000+10000kg

=18000kg

total force (F)= 40000N+ 5000N

=45000N

Newton's law says,

F=ma

45000= 18000 ×a

45000/18000 =a

Ans: a=2.5 m/s^2

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