define: A train 180 m long passes a wagon 90 m long moving at a speed of 36 m/s in 30seconds . calculate the speed of the train if the wagon is moving in the same direction as that of the train.
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Answer:
Vrel=
20−10=10
20−10=10
m/sec
Time=
D
Vrel
=
180
10
=18sec
DVrel=18010=18sec
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