Final answer:
To convert 81 km/hr to m/sec, divide 81 by 3.6 to get approximately 22.5 m/sec.
Step-by-step explanation:
To convert kilometers per hour to meters per second, you need to know that 1 kilometer is equal to 1000 meters and 1 hour is equal to 3600 seconds. To convert, divide the value in kilometers per hour by 3.6.
So, to convert 81 km/hr to m/sec, you would divide 81 by 3.6 to get approximately 22.5 m/sec.
Therefore, 81 km/hr is approximately 22.5 m/sec.
Learn more about converting kilometers per hour to meters per second