Question

Convert 72 km/h into metres per second.

Solution

1. Use 1 km/h = 5/18 m/s.
2. 72 km/h = 72 x 5/18 m/s.
3. 72 / 18 = 4, so the speed is 4 x 5 = 20 m/s.
4. Therefore, 72 km/h equals 20 m/s.