Question

convert a velocity of 20 ms^1 in km per hour​

Answer 1

Answer:

72m/s

Explanation:

to convert in m/s multiply by 18/5

Answer 2

Answer :

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 does not change and the units of measure do. Then

20 msec×3600 sec1 hr×1 km1000 m

=20×3600×1 km1×1000 hr

=720001000 km/hr

=721 km/hr

=72 km/hr

is the answer.

Notice that seconds and meters cancelled out, leaving kilometers and hours.