A train 4.00 3 102 m long is moving on a straight track with a speed of 82.4 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.4 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. Disregard the width of the crossing.

The  value  is  

Explanation:

From the question we are told that

Generally the average velocity of the train is mathematically represented as

substituting  82.4 km/h for  u and   16.4 km/h. for  v

Generally the time taken is mathematically represented as

substituting   49.4 \  km/h for  v and  

converting to seconds

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