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Physics
14.07.2021 03:41
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A train 4.00 3 102 m long is moving on a straight track with a speed of 82.4 km/h.

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.
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tyrique86
tyrique86
4,7(58 marks)

The  value  is  t =29.2 \ s

Explanation:

From the question we are told that

Generally the average velocity of the train is mathematically represented as

          v = \frac{u + v}{2}

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

       v = \frac{82.4 + 16.4}{2}

          v = 49.4 \ km/h

Generally the time taken is mathematically represented as

     t = \frac{ L}{v}

substituting   49.4 \  km/h for  v and  4.00 * 10^2 \ m = 0.400 \ km

         t = \frac{ 0.400}{49.4}

          t = 0.00809 \ h

converting to seconds

         t = 0.00809 * 3600

          t =29.2 \ s

     

rasv3491
rasv3491
4,8(69 marks)

hello im here

Explanation:

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