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Byju's Answer

Standard XII

Physics

Finding Average Velocity

Two parallel ...

Question

Two parallel rail tracks run north south. Train A moves north with a speed of 54 km/h and train B moves south with a speed of 90 km/h. What is the
a)velocity of train B with respect to A
b)velocity of ground with respect to ground.

In the text book they are converting 54k km/h into 15 m/s and -90 km/h into -25 m/s. which method are they using. Please clear my doubt

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Solution

If you want to know just the conversion I will tell you

54km/hour

1km =1000m

1hour =60minutes =6060seconds=3600seconds

So 1km/hour =1000m /3600seconds = 5/18 m/s

So here 54km/hour = 545/18 =35 =15m/s

similarly -90 km/h = -905/18 = -25m/s

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