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A train 150 meters long passes a pole in 10 seconds. What is the speed of the train in km/h?
45 km/h
50 km/h
54 km/h
60 km/h
54 km/h
Remember the conversion factor: multiply m/s by 18/5 to get km/h. Since 150/10 = 15 m/s, calculating 15 * 18/5 = 3 * 18 = 54.
Length of the train (d) = 150 meters, Time taken to pass a pole (t) = 10 seconds.
Speed=TimeDistanceтАЛ├Ч518тАЛ
Remember the conversion factor: multiply m/s by 18/5 to get km/h. Since 150/10 = 15 m/s, calculating 15 * 18/5 = 3 * 18 = 54.
Many students calculate the speed in m/s (15 m/s) and forget to convert it into km/h, often selecting an incorrect option.
Calculate speed in m/s
Since the train passes a pole, the distance covered is equal to the length of the train. Speed = Distance / Time.
Speed=10150тАЛ=15┬аm/s
Convert m/s to km/h
To convert from m/s to km/h, multiply the speed by 18/5.
15├Ч518тАЛ=3├Ч18=54┬аkm/h
C is correct because the calculated speed of the train is 54 km/h.
This unit conversion logic (5/18 or 18/5) is frequently tested in physics problems involving kinematics and projectile motion.
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