Question

4. Convert a velocity of 20 m s-1 in kilometre per hour.​

Answer 1

Answer:

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Explanation:

72 km per hour is answer

Answer 2

1000 m=1 km and

60 min=3600 sec=1 hr

So to change 20 m/sec into km/hr, multiply 20 m/sec by

(3600 sec/1 hr)×(1 km/1000 m).

These two factors are conversion factors.

Each of these is equal to 1 so that 20 m/sec is multiplied by 1×1=1.This means its value donot change and the units of measure do. Then

20 msec×3600 sec1 hr×1 kmr1000 m

=20×3600×1 km/1×1000 hr

=72000 /1000km/hr

=72/1km/hr

=72 km/hr

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