Question

Convert a velocity of 20m/s in km/h

Answer 1

Answer:

72 kmph

Explanation:

For it, we should know that

• 1 km = 1000 m
• 1 min = 60 s
• 1 hr = 60 min

20 m/s

= (20 × 1 m) / (1 s)

= [20 × 1 m × 1 km / (1000 m)] / [1 s × 1 min / (60 s)]

= [20/1000 km] / [1/60 min]

= [20/1000 km] / [1/60 min × 1 hr / (60 min)]

= [20/1000 km] / [1/3600 hr]

= (20 × 3600 / 1000) kmph

= (20 × 36/10) kmph

= (20 × 18/5) kmph

= 72 kmph

__________________________

Quick method:

1 kmph = 5/18 m/s

So,

20 m/s

= 20 m/s × [1 kmph / (5/18 m/s)]

= 20 m/s × 18/5 kmph

= 72 kmph

Answer 2

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