A train $400$ m long is moving on a straight track with a speed of $81\mathrm{.}2$ km$/$h$.$ The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of $15\mathrm{.}8$ km$/$h$.$ Assuming constant acceleration, determine how long the train blocked the crossing? Disregard the width of the crossing. 

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To determine the duration for which the train blocks the crossing we need to calculate the time it t... View the full answer