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It describes how quickly or slowly an object moves from one place to another. The standard (SI) unit of speed is meters per second (m/s), but it can also be expressed in other units, such as kilometers per hour (km/h), miles per hour (mph), or feet per second (ft/s), depending on the context or the country's measurement system.
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- Speed and Velocity
- Speed
- Units
- Average vs Instantaneous Speed
- Constant Speed
- Velocity
- Relative
Speed is how fast something moves. Velocity is speed with a direction. Saying Ariel the Dog runs at 9 km/h(kilometers per hour) is a speed. But saying he runs 9 km/h Westwardsis a velocity. Imagine something moving back and forth very fast: it has a high speed, but a low (or zero) velocity.
Speed is measured as distance moved over time. Speed = Distance Time We can also use these symbols: Speed = Δs Δt Where Δ ("Delta") means "change in", and 1. smeans distance ("s" for "space") 2. tmeans time
Speed is commonly measured in: 1. meters per second (m/s or m s-1), or 2. kilometers per hour (km/h or km h-1) A km is 1000 m, and there are 3600 seconds in an hour, so we can convert like this (see Unit Conversion Methodto learn more): So 1 m/s is equal to 3.6 km/h
The examples so far calculate average speed: how far something travels over a period of time. But speed can change as time goes by. A car can go faster and slower, maybe even stop at lights. So there is also instantaneous speed: the speed at an instantin time. We can try to measure it by using a very short span of time (the shorter the better).
When the speed does not change it is constant. For constant speed, the average and instantaneous speeds are the same.
Velocity is speed with a direction. It is actually a vector ... ... as it has magnitude anddirection Because the direction is important velocity uses displacementinstead of distance: Speed = Distance Time Velocity = Displacement Time in a direction. Learn more at Vectors.
Motion is relative. When we say something is "at rest" or "moving at 4 m/s" we forget to say "in relation to me" or "in relation to the ground", etc. Think about this: are you really standing still? You are on planet Earth which is spinning at 40,075 km per day (about 1675 km/h or 465 m/s), and moving around the Sun at about 100,000 km/h, which is ...
50 km/h is equal to 31.068560 mph Miles per hour to KiloMeters per hour conversion example. Sample task: convert 30 mph to km/h. Solution: Formula: mph * 1.609344 = km/h Calculation: 30 mph * 1.6093 = 48.280320 km/h End result: 30 mph is equal to 48.280320 km/h Km per hour to Meters per second conversion example. Sample task: convert 5 km/h to ...
The most common units of speed are metres per second (m/s), kilometres per hour (km/h) and miles per hour (mph). ... Laura walks 17 km at an average speed of 4.25 km/h. Calculate how long it took ...
y Arithmetic Speed Distance Time SOLUTIONS 1.(a)80 km/h (b)50 km/h (c)60 km/h (d)90 km/h (e)70 km/h (f)133.33 km/h (g)500 km/h (h)90 km/h (i)40 km/h (j)32 km/h (k)60 km/h (l)120 km/h (m)105 km/h (n)5.625 km/h 2.(a)2 hours (b)4 hours (c)1 hours and 30 mins (d)1 hour and 15 mins (e)1 hour and 45 mins (f)2 hours and 40 mins 3.(a)50 km (b)300 km (c ...
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Aug 21, 2023 · for quick conversions. m/s × 2.237 = mi/h. Solution. To convert m/s to mi/h, use the conversion factor. 1 m/s = 2.23693629 mi/h. Then divide both sides of the equation by m/s, to get the conversion ratio. 1 = 2.23693629 mi/h / m/s. Using the conversion ratio to complete the unit conversion, basically multiplying the input by 1, the m/s units ...
