Question

# Express the following speeds in m/s. (a) 45km/h (b) 135 km/h (c) 90 km/h (d) 75km/h

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Solution

## We know: 1 km = 1000 m 1 h = (60 $×$ 60 ) s = 3600 s Now, (a) 45 km/h = (45 $×$ 1000)/(1 $×$ 3600) = 12.5 m/s (b) 135 km/h = (135 $×$ 1000)/(1 $×$ 3600) = 37.5 m/s (c) 90 km/h = (90 $×$ 1000)/(1 $×$ 3600) = 25 m/s (d) 75 km/h = (75 $×$ 1000)/(1 $×$ 3600) = 20.83 m/s

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