Question

a train consisting of 40 Wagons of 20 ton each is pulled by an engine with a velocity of 20 metre per second the power delivered by the engine is 160 kilowatts the frictional force offered per ton of the train is ​

Answer 1

Answer:

The answer will be 8 KW

Explanation:

According to the problem the mass of each wagon is 20 ton

There are 40 wagons of the train.

Therefore the total mass of the train is 40 x 20 = 800 ton

The velocity of the engine is 20 m/s

The power is delivered by the engine , P = 160 KW= 160000 W

Let the frictional force be f

Now we know,

P = force x velocity

=>  160000  = f x 20

=> f = 8000 W or 8 KW