To convert kilometers per hour (km/hr) to meters per second (m/sec), we need to multiply the speed by 0.27778.
So, to convert 81 km/hr to m/sec, we multiply it by 0.27778 as follows:
81 km/hr x 0.27778 = 22.5 m/sec (rounded to one decimal place)
Therefore, 81 km/hr is equal to 22.5 m/sec (approximately).
~~~Harsha~~~