Question

calculate the power of an engine which pulls a train of 5000 kg from rest, through a displacement of 9 km in 10 minute

Answer 1

Answer:

250 Newton is the power of the engine.

Explanation:

We have,

u=0

s=9000m (9km)

t=600s (10 min)

Using second equation of motion,

s=ut+1/2*a*t^2

⇒9000=0+1/2*a*(600)^2

⇒9000=1/2*a*360000

⇒9000=180000a

⇒1/20 = a

So, the acceleration in the train is 1/20 m/s^2.

Now, the pulling force of the engine = mass×acceleration = 5000kg × 1/20

= 250 Newton.

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