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A train 200m long passes a pole in 20 seconds. What is the speed of the train in km/hr?
36 km/hr
40 km/hr
30 km/hr
45 km/hr
36 km/hr
Use the conversion factor 18/5 directly. Since 200/20 = 10 m/s, multiply 10 by 18/5 to get 36 km/hr instantly.
Length of the train (d) = 200 m, Time taken (t) = 20 seconds.
Speed=TimeDistanceтАЛ├Ч518тАЛ
Use the conversion factor 18/5 directly. Since 200/20 = 10 m/s, multiply 10 by 18/5 to get 36 km/hr instantly.
Failing to convert units from m/s to km/hr, resulting in an answer of 10 instead of 36.
Calculate speed in m/s
To find the speed in m/s, divide the distance covered (length of the train) by the time taken.
v=20┬аs200┬аmтАЛ=10┬аm/s
Convert m/s to km/hr
To convert speed from m/s to km/hr, multiply the value by 18/5.
10├Ч518тАЛ=2├Ч18=36┬аkm/hr
A is correct because the speed calculated is 36 km/hr, which matches option A.
Always check unit consistency first. In Physics, this is the 'Dimensional Analysis' check, which prevents errors in kinematics problems.
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