A train 400 m long is moving on a straight track with a speed of 84.3 km/h. The engineer applies the brakes at a crossing, and later the last car…

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A train 400 m long is moving on a straight track with a speed of 84.3 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 17.7 km/h. Assuming constant acceleration, determine how long the train blocked the crossing. Disregard the width of the crossing.

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