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## Speed

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**Speed**Learning Objective: To understand and use formulae involving speed. How many units of speed can you think of?**How fast?**Fastest Snail Max speed of a 747 Sound Light Cruising speed of Concorde**How fast?**Fastest Snail 967 km/h Max speed of a 747 2150 km/h 0.01 km/h Sound 1.08 x 109 km/h Light Cruising speed of Concorde 1238 km/h**D**S T Miles per hour (mph) Kilometres per hour (kph or km/h) Metres per second (m/s or ms-1) Speed = Distance Time Or S = D T**D**S T Speed = Distance Time Time = Distance Speed Distance = Speed x Time**D**S T A man is running at a speed of 8 km/h for a distance of 5200m. Find the time taken in minutes.**D**S T It has taken an aeroplane 6 hours to travel a journey at an average speed of 500 km/h. How far has it travelled?**What is 54 km/h in m/s ?**54 km/h = 54 000 metres / hour = 54 000 metres / minute 60 = 54 000 metres / second 60 x 60 = 15 m/s