Posted by **YASH** on Sunday, May 22, 2011 at 6:32am.

A TRAIN IS MOVING ON A STRAIGHT TRCK AND TRAVELS AT A SPEED OF 72KM/HR AND PASSES A POLE BIN 3 SECONDS. FIND THE TJME TAKEN TO PASS A BRIDGE OF LENGTH 540m

- SCIENCE(PHYSICS) -
**drwls**, Sunday, May 22, 2011 at 9:12am
It must be a rather short train if it passes a pole in three seconds.

72 km/h = 20 m/s. The length of the train must be

L = 20 m/s * 3 s = 60 meters

To cross a bridge 540 m long, you have to add the times it takes the engine to cross (540/20 = 27 seconds) and the three seconds needed for the rest of the train to reach the end. That is a total of 30 seconds.

- SCIENCE(PHYSICS) -
**kjk**, Friday, June 10, 2011 at 3:51am
minokn jkh kbhhbkhjkhjkhjkkkk

## Answer this Question

## Related Questions

- SCIENCE(PHYSICS) - A TRAIN IS MOVING ON A STRAIGHT TRCK AND TRAVELS AT A SPEED ...
- SCIENCE(PHYSICS) - a train is moving on a straight track n travels at a speed ...
- SCIENCE(PHYSICS) - a train is moving on a straight track n travels at a speed ...
- physics - James Bond is trying to jump from a bridge and land on the first car ...
- Physics - James Bond is trying to jump from a bridge and land on the first car ...
- physics - 1.A train passes an electric post in 8sec and a bridge of length 1km ...
- physics - Cora is a passenger in a car traveling east along a country highway ...
- algebra 2 - I don't know how to do this the speed of train A is 18mph slower ...
- physics - Consider the freight train in Figure below. Suppose 17 boxcars pass by...
- AP Physics PLEASE HELP DUE TOMORROW - Consider the freight train. Suppose 15 ...

More Related Questions