Question

Convert 81 km/hr to m/s:
a) 22.5 m/s
b) 30 m/s
c) 81 m/s
d) 45 m/s

Answer 1

To convert 81 km/h to m/s, multiply by 1000 to convert kilometers to meters and then divide by 3600 to convert hours to seconds, which gives the answer 22.5 m/s.

Step-by-step explanation:

To convert a speed from kilometers per hour (km/h) to meters per second (m/s), you need two conversion factors. One is to convert hours to seconds (1 hour = 3600 seconds), and the other is to convert kilometers to meters (1 kilometer = 1000 meters). Using these conversions:

Speed in m/s = (Speed in km/h × 1000 meters/kilometer) / 3600 seconds/hour

So, 81 km/h in m/s is:
81 km/h × (1000 m/km) / (3600 s/h) = 81000 m / 3600 s = 22.5 m/s

Therefore, the correct answer is 22.5 m/s.