Subway

Subway train went between two stations that gradually accelerated for 26 seconds and reached a speed of 72 km/h. At this rate, went 56 seconds. Then 16 seconds slowed to a stop. What was the distance between the stations?

Correct result:

s =  1.5 km

Solution:

 s=s1+s2+s3 s=12a1t12+vt2+12a3t32 s=12v0t1t12+vt2+12v0t3t32 s=12vt1+vt2+12vt3 s=v(t12+t2+t32) s=723600(262+56+162)=1.5 km



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