Asked Sep 25, 2019

A train 400 m long is moving on a straight track with a speed of 84.8 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.2 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. Disregard the width of the crossing.


Expert Answer

Step 1

The average velocity of the train moving on a straight track is,

Substitute the values,


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2 84.8km/16.2km/h 2 =50.5km/h

Step 2

The time taken by the train blocked on the c...


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(400m0.001k t= (505km/h) 0.400km 50.5km/h 0.00792h 3600s' 1h 28.5s


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