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# Passenger train passing power pole

Science

A passenger train of length L = 100 m travels at a speed of v = 72 km/h. How long does it take the train to pass a power pole?
How to solve this physics task?

Last time edited 2017-09-29

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First of all, make sure that all the assigned quantities are in the si base units. How we can see, we must convert speed from km/h to m/s. $v = 72 km/h = 20 m/s$

To find passing time, we will use that formula: $t=\frac{L}{v}$. So complete solution is $t=\frac{100m}{20m/s}=5s$.

Answer: the train passes the power pole in 5s.

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