Answer:
21 m/s < 72 km/h
Step-by-step explanation:
To solve this, we have to first convert 72 km/h into m/s.
72 km = 72,000 m
1 hour = 60 min × 60 sec
= 3600 sec
As per the law of Speed = [tex]\frac{Distance}{Time}[/tex],
Speed = [tex]\frac{72000}{3600}[/tex]
= 20 m/s
20 < 21
So, 21 m/s < 72 km/h
Hope it helps ❤️