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  • 1 answers

Naveen Sharma 7 years, 9 months ago

Ans. Let Length of Train = x meter

Time taken to cover post = 10 sec

if a train pass post. it mean it is covering distance equal to its length 

So speed = distancetime=x10 ....(1)

Again if it pass a bridge it cover distance equal to sum of length of bridge and length of train. 
Length of Bridge = 2 Km = 2000 m

So distance covered =  ( 2000 + x ) m 
Time taken = 110 sec 
So Speed = 2000+x110 ...........(2)

From (1) and (2), we get

 =>x10=2000+x110

=> 110 x = 20000 + 10 x

=> 100x = 20000

=> x = 20000100=200 m/s

  • 1 answers

Gaurav Bhardwaj 7 years, 10 months ago

First find efficiency of engine = 1- lower temperature/higher temperature = 1/2 then amount of heat energy is two times of work done = 2400 joule 

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