Question

a train travel for 30 minutes with a velocity of 54km/h and then 120 minutes with a velocity of 72 km/h in the same direction . calculate avarage velocity​

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

Let

v1 = 54km/h

t1 = 30 minutes = 1/2 hr

v2 = 72 km/h

t2 = 120 minutes = 2 hrs

So, according to the data provided,

Distance traveled in first 30 minutes = v1 × t1 = [54 × (1/2)] km = 27 km

Distance travelled in next 120 minutes = v2 × t2 = [72 × 2] km = 144 km

Total distance travelled by the train = 27 km + 144 km = 171 km

Total time taken = 1/2 hr + 2 hrs = 5/2 hrs

Since, average velocity = Total displacement / Total time taken

average velocity = Total displacement / Total time taken

= 171/(5/2) km/h

= (171 × 2)/5 km/h

= 342/5 km/h

= 68.4 km/h

<v> = 68.4 km/h

Hence, the average velocity of the train is 68.4 km/h.