Convert 72 km/h to metres per second.
Answer and explanation
Correct answer: B. 20 m/s
- Step 1: 1 km/h = 1000 m ÷ 3600 s = 1 ÷ 3,6 m/s.
- Step 2: 72 ÷ 3,6 = 20 m/s.
Answer
20 m/s.
Why not the others: 259,2 m/s: the speed was multiplied by 3,6 instead of divided. 2 m/s: the wrong conversion factor was used. 1,2 m/s: the speed was divided by 60, as when converting to km per minute.
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