Calculating Speed
- For objects that are moving with a constant speed, use the equation below to calculate the speed:
- Where:
- v = speed in metres per second (m/s)
- s = distance travelled in metres (m)
- t = time taken in seconds (s)
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A hiker might have an average speed of 2.0 m/s, whereas a particularly excited bumble bee can have average speeds of up to 4.5 m/s
Average speed, total distance, time formula triangle
Race drivers know all about non-uniform motion, especially slowing down for corners and speeding up on the straight sections of track
Florence Griffith Joyner set the women’s 100 m world record in 1988, with a time of 10.49 s. Calculate her average speed during the race.
Step 1: List the known quantities
Step 2: Write the relevant equation
average speed = total distance ÷ time taken
Step 3: Check any unit conversions
Step 4: Substitute the values for total distance and time
Average speed = 100 ÷ 10.49 = 9.53288... = 9.53 m/s
Remember that average speed is the mean speed of the moving object.
Its speed at a specific moment could be higher or lower - so because the speed changes you need to consider the total distance and time taken.
the (exam) results speak for themselves:
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Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.