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Calculating speed
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A definition of speed The speed of an object is how fast or slow it's moving. You can calculate speed using the equation 'speed = distance/time'.
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Calculating speed This equation shows the relationship between speed, distance and time. speed (metres per second, m/s) = distance (metre, m) / time (seconds, s) Example: A person runs 200m in 20s speed = distance/time speed = 200m/20s speed = 10m/s
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Formula triangles Formula, such as the one used to calculate speed, can be put into formula triangles.
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The units of speed Speed Distance Time m/s metres per second
km/h kilometres per hour mph miles per hour Distance m metres Km kilometres M miles Time s seconds h hours
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Changing miles into kilometres
1 km: miles 1 mile: km Five miles equals eight kilo- metres. How you could do this in your head: You take the kilometre number, 144, and halve it; 72. Then take a quarter of your half, 18, and just add the two together = 90. That’s your answer in miles
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