Question

1.find the average speed of train travelling 144 kilometre in 2 hour Express the answer metre second

plz answer with solution

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Answer 1

Answer:

20 m/s.

Explanation:

Average speed is given by

$v_{av}={Total~distance~travelled\over Total~time~taken$

Hence,

$v_{av}={144\over 2}~km/h=72~km/h\\\\or,\\\\v_{av}=72~{1000~metres\over60\times 60~seconds}\\\\v_{av}=20~m/s$

Answer 2

Answer:

Speed of a train = 144 km

Time taken in covering 144 km = 2 h.

Average Speed = Total distance travelled

-----------------------------------

Total time taken

= 144 km

-----------------

2 h

= 72 km/h

To Convert Km/h to M/s

= 72 × 5

-----

18

= 20 m/s

.

. . The answer is 20 m/s

Explanation:

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